diff --git a/CHANGELOG.md b/CHANGELOG.md
index ee4dcd6b..5a2a825b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+# 17.1.4(2024-07-16)
+
+### Fix
+
+-   Fix ([#1389](https://github.com/JsDaddy/ngx-mask/issues/1389))
+
 # 17.1.3(2024-07-16)
 
 ### Fix
diff --git a/package.json b/package.json
index 8f0bf700..91c4eb9c 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "ngx-mask",
-    "version": "17.1.3",
+    "version": "17.1.4",
     "description": "Awesome ngx mask",
     "license": "MIT",
     "engines": {
diff --git a/projects/ngx-mask-lib/package.json b/projects/ngx-mask-lib/package.json
index 0e348689..f0b75121 100644
--- a/projects/ngx-mask-lib/package.json
+++ b/projects/ngx-mask-lib/package.json
@@ -1,6 +1,6 @@
 {
     "name": "ngx-mask",
-    "version": "17.1.3",
+    "version": "17.1.4",
     "description": "awesome ngx mask",
     "keywords": [
         "ng2-mask",
diff --git a/projects/ngx-mask-lib/src/lib/ngx-mask-applier.service.ts b/projects/ngx-mask-lib/src/lib/ngx-mask-applier.service.ts
index ec382b5a..31feab2b 100644
--- a/projects/ngx-mask-lib/src/lib/ngx-mask-applier.service.ts
+++ b/projects/ngx-mask-lib/src/lib/ngx-mask-applier.service.ts
@@ -266,24 +266,50 @@ export class NgxMaskApplierService {
             }
 
             if (backspaced) {
+                const inputValueAfterZero = inputValue.slice(
+                    this._findFirstNonZeroDigitIndex(inputValue),
+                    inputValue.length
+                );
+                const positionOfZeroOrDecimalMarker =
+                    inputValue[position] === MaskExpression.NUMBER_ZERO ||
+                    inputValue[position] === decimalMarker;
+                const zeroIndexNumberZero = inputValue[0] === MaskExpression.NUMBER_ZERO;
+                const zeroIndexMinus = inputValue[0] === MaskExpression.MINUS;
+                const firstIndexDecimalMarker = inputValue[1] === decimalMarker;
+                const firstIndexNumberZero = inputValue[1] === MaskExpression.NUMBER_ZERO;
+                const secondIndexDecimalMarker = inputValue[2] === decimalMarker;
+
                 if (
-                    inputValue[0] === MaskExpression.NUMBER_ZERO &&
-                    inputValue[1] === this.decimalMarker &&
-                    (inputValue[position] === MaskExpression.NUMBER_ZERO ||
-                        inputValue[position] === this.decimalMarker)
+                    zeroIndexNumberZero &&
+                    firstIndexDecimalMarker &&
+                    positionOfZeroOrDecimalMarker &&
+                    position < 2
                 ) {
                     // eslint-disable-next-line no-param-reassign
-                    inputValue = inputValue.slice(2, inputValue.length);
+                    inputValue = inputValueAfterZero;
                 }
                 if (
-                    inputValue[0] === MaskExpression.MINUS &&
-                    inputValue[1] === MaskExpression.NUMBER_ZERO &&
-                    inputValue[2] === this.decimalMarker &&
-                    (inputValue[position] === MaskExpression.NUMBER_ZERO ||
-                        inputValue[position] === this.decimalMarker)
+                    zeroIndexMinus &&
+                    firstIndexNumberZero &&
+                    secondIndexDecimalMarker &&
+                    positionOfZeroOrDecimalMarker &&
+                    position < 3
                 ) {
                     // eslint-disable-next-line no-param-reassign
-                    inputValue = MaskExpression.MINUS + inputValue.slice(3, inputValue.length);
+                    inputValue = MaskExpression.MINUS + inputValueAfterZero;
+                }
+                if (
+                    inputValueAfterZero !== MaskExpression.MINUS &&
+                    ((position === 0 && !zeroIndexNumberZero) ||
+                        (this.allowNegativeNumbers &&
+                            position === 1 &&
+                            zeroIndexMinus &&
+                            !firstIndexNumberZero))
+                ) {
+                    // eslint-disable-next-line no-param-reassign
+                    inputValue = zeroIndexMinus
+                        ? MaskExpression.MINUS + inputValueAfterZero
+                        : inputValueAfterZero;
                 }
             }
             // TODO: we had different rexexps here for the different cases... but tests dont seam to bother - check this
@@ -961,4 +987,14 @@ export class NgxMaskApplierService {
                 : `${emptyOrMinus}${integerString}${decimal}${decimalPart}`;
         }
     }
+
+    private _findFirstNonZeroDigitIndex(inputString: string): number {
+        for (let i = 0; i < inputString.length; i++) {
+            const char = inputString[i];
+            if (char && char >= '1' && char <= '9') {
+                return i;
+            }
+        }
+        return -1;
+    }
 }
diff --git a/projects/ngx-mask-lib/src/test/delete.cy-spec.ts b/projects/ngx-mask-lib/src/test/delete.cy-spec.ts
index 90ee2560..d05307fe 100644
--- a/projects/ngx-mask-lib/src/test/delete.cy-spec.ts
+++ b/projects/ngx-mask-lib/src/test/delete.cy-spec.ts
@@ -375,4 +375,180 @@ describe('Directive: Mask (Delete)', () => {
             .type('{backspace}'.repeat(8))
             .should('have.value', '__:__:____');
     });
+
+    it('should correct work after backspace separator.6 decimalMarker . thousandSeparator ,', () => {
+        cy.mount(CypressTestMaskComponent, {
+            componentProperties: {
+                mask: 'separator.6',
+                decimalMarker: '.',
+                thousandSeparator: ',',
+            },
+            imports: [CypressTestMaskModule],
+        });
+
+        cy.get('#masked')
+            .type('0.000001')
+            .should('have.value', '0.000001')
+            .type('{leftArrow}'.repeat(2))
+            .type('{backspace}')
+            .should('have.value', '0.00001')
+            .type('{leftArrow}'.repeat(2))
+            .type('{backspace}')
+            .should('have.value', '0.0001')
+            .type('{backspace}')
+            .should('have.value', '1');
+    });
+
+    it('should correct work after backspace separator.2 decimalMarker . thousandSeparator ,', () => {
+        cy.mount(CypressTestMaskComponent, {
+            componentProperties: {
+                mask: 'separator.2',
+                decimalMarker: '.',
+                thousandSeparator: ',',
+            },
+            imports: [CypressTestMaskModule],
+        });
+
+        cy.get('#masked')
+            .type('0.01')
+            .should('have.value', '0.01')
+            .type('{leftArrow}')
+            .type('{backspace}')
+            .should('have.value', '0.1')
+            .type('{leftArrow}')
+            .type('{backspace}')
+            .should('have.value', '1');
+    });
+
+    it('should correct work after backspace separator.2 decimalMarker . thousandSeparator , allowNegative', () => {
+        cy.mount(CypressTestMaskComponent, {
+            componentProperties: {
+                mask: 'separator.2',
+                decimalMarker: '.',
+                thousandSeparator: ',',
+                allowNegativeNumbers: true,
+            },
+            imports: [CypressTestMaskModule],
+        });
+
+        cy.get('#masked')
+            .type('-0.01')
+            .should('have.value', '-0.01')
+            .type('{leftArrow}')
+            .type('{backspace}')
+            .should('have.value', '-0.1')
+            .type('{leftArrow}')
+            .type('{backspace}')
+            .should('have.value', '-1');
+    });
+
+    it('should correct work after backspace separator.3 decimalMarker . thousandSeparator , allowNegative', () => {
+        cy.mount(CypressTestMaskComponent, {
+            componentProperties: {
+                mask: 'separator.3',
+                decimalMarker: '.',
+                thousandSeparator: ',',
+                allowNegativeNumbers: true,
+            },
+            imports: [CypressTestMaskModule],
+        });
+
+        cy.get('#masked')
+            .type('-0.014')
+            .should('have.value', '-0.014')
+            .type('{leftArrow}'.repeat(2))
+            .type('{backspace}')
+            .should('have.value', '-0.14')
+            .type('{leftArrow}'.repeat(2))
+            .type('{backspace}')
+            .should('have.value', '-14');
+    });
+
+    it('should correct work after backspace separator.3 leadZero allowNegative', () => {
+        cy.mount(CypressTestMaskComponent, {
+            componentProperties: {
+                mask: 'separator.3',
+                allowNegativeNumbers: true,
+                leadZero: true,
+            },
+            imports: [CypressTestMaskModule],
+        });
+
+        cy.get('#masked')
+            .type('-0.1')
+            .should('have.value', '-0.1')
+            .type('{leftArrow}'.repeat(2))
+            .type('{backspace}')
+            .should('have.value', '-1')
+            .type('{backspace}')
+            .should('have.value', '-');
+    });
+
+    it('should correct work after backspace separator', () => {
+        cy.mount(CypressTestMaskComponent, {
+            componentProperties: {
+                mask: 'separator',
+            },
+            imports: [CypressTestMaskModule],
+        });
+
+        cy.get('#masked')
+            .type('0.33')
+            .should('have.value', '0.33')
+            .type('{leftArrow}'.repeat(2))
+            .type('{backspace}')
+            .should('have.value', '33');
+    });
+
+    it('should correct work after backspace separator leadZero', () => {
+        cy.mount(CypressTestMaskComponent, {
+            componentProperties: {
+                mask: 'separator',
+                leadZero: true,
+            },
+            imports: [CypressTestMaskModule],
+        });
+
+        cy.get('#masked')
+            .type('0.33')
+            .should('have.value', '0.33')
+            .type('{leftArrow}'.repeat(2))
+            .type('{backspace}')
+            .should('have.value', '33');
+    });
+
+    it('should correct work after backspace separator allowNegativeNumbers', () => {
+        cy.mount(CypressTestMaskComponent, {
+            componentProperties: {
+                mask: 'separator',
+                allowNegativeNumbers: true,
+            },
+            imports: [CypressTestMaskModule],
+        });
+
+        cy.get('#masked')
+            .type('-0.33')
+            .should('have.value', '-0.33')
+            .type('{leftArrow}'.repeat(2))
+            .type('{backspace}')
+            .should('have.value', '-33');
+    });
+
+    it('should correct work after backspace separator leadZero', () => {
+        cy.mount(CypressTestMaskComponent, {
+            componentProperties: {
+                mask: 'separator',
+                leadZero: true,
+                allowNegativeNumbers: true,
+            },
+            imports: [CypressTestMaskModule],
+        });
+
+        cy.get('#masked')
+            .type('-0.33')
+            .should('have.value', '-0.33')
+            .type('{leftArrow}'.repeat(2))
+            .type('{backspace}')
+            .should('have.value', '-33');
+    });
 });
diff --git a/projects/ngx-mask-lib/src/test/utils/cypress-test-component.component.ts b/projects/ngx-mask-lib/src/test/utils/cypress-test-component.component.ts
index 5c228f92..5a81b095 100644
--- a/projects/ngx-mask-lib/src/test/utils/cypress-test-component.component.ts
+++ b/projects/ngx-mask-lib/src/test/utils/cypress-test-component.component.ts
@@ -14,6 +14,7 @@ import { IConfig, NGX_MASK_CONFIG } from 'ngx-mask';
             [suffix]="suffix"
             [leadZero]="leadZero"
             [showMaskTyped]="showMaskTyped"
+            [allowNegativeNumbers]="allowNegativeNumbers"
             [decimalMarker]="decimalMarker"
             [thousandSeparator]="thousandSeparator"
             [shownMaskExpression]="shownMaskExpression"
@@ -37,6 +38,8 @@ export class CypressTestMaskComponent {
 
     @Input() public hiddenInput = false;
 
+    @Input() public allowNegativeNumbers = false;
+
     @Input() public prefix = '';
 
     @Input() public suffix = '';