diff --git a/plugin/src/main/java/org/opensearch/ml/utils/error/ErrorMessage.java b/plugin/src/main/java/org/opensearch/ml/utils/error/ErrorMessage.java
index 48307c50f2..0cb095cb06 100644
--- a/plugin/src/main/java/org/opensearch/ml/utils/error/ErrorMessage.java
+++ b/plugin/src/main/java/org/opensearch/ml/utils/error/ErrorMessage.java
@@ -44,7 +44,7 @@ public ErrorMessage(Throwable exception, int status) {
     }
 
     private String fetchType() {
-        return exception.getClass().getSimpleName();
+        return exception == null ? "Unknown Exception" : exception.getClass().getSimpleName();
     }
 
     protected String fetchReason() {
@@ -52,6 +52,10 @@ protected String fetchReason() {
     }
 
     protected String fetchDetails() {
+        if (exception == null) {
+            return "No Exception Details";
+        }
+
         final String msg;
         // Prevent the method from exposing internal information such as internal ip address etc. that is a security concern.
         if (hasInternalInformation(exception)) {
diff --git a/plugin/src/test/java/org/opensearch/ml/utils/error/ErrorMessageTests.java b/plugin/src/test/java/org/opensearch/ml/utils/error/ErrorMessageTests.java
index 9e6e8586fe..14419a1ce9 100644
--- a/plugin/src/test/java/org/opensearch/ml/utils/error/ErrorMessageTests.java
+++ b/plugin/src/test/java/org/opensearch/ml/utils/error/ErrorMessageTests.java
@@ -144,4 +144,12 @@ public void getDetails() {
 
         assertEquals(errorMessage.getDetails(), "illegal state");
     }
+
+    @Test
+    public void ConstructNullException() {
+        ErrorMessage errorMessage = new ErrorMessage(null, SERVICE_UNAVAILABLE.getStatus());
+
+        assertEquals(errorMessage.getType(), "Unknown Exception");
+        assertEquals(errorMessage.getDetails(), "No Exception Details");
+    }
 }