diff --git a/data-manager/src/test/java/org/orbisgis/datamanager/h2gis/H2GISTests.java b/data-manager/src/test/java/org/orbisgis/datamanager/h2gis/H2GISTests.java
index a0610f80..7ffb9839 100644
--- a/data-manager/src/test/java/org/orbisgis/datamanager/h2gis/H2GISTests.java
+++ b/data-manager/src/test/java/org/orbisgis/datamanager/h2gis/H2GISTests.java
@@ -329,4 +329,17 @@ public void hasTable() throws SQLException {
         assertTrue(h2GIS.hasTable("table1"));
         assertFalse(h2GIS.hasTable("OrbisGIS"));
     }
+
+    @Test
+    void testGetTableOnEmptyTable() throws SQLException {
+        Map<String, String> map = new HashMap<>();
+        map.put(DataSourceFactory.JDBC_DATABASE_NAME, "./target/loadH2GIS");
+        H2GIS h2GIS = H2GIS.open(map);
+        h2GIS.execute("DROP TABLE IF EXISTS table1, table2; " +
+                "CREATE TABLE table1 (id int, the_geom geometry(point));" +
+                "CREATE TABLE table2 (id int, val varchar);");
+        assertNotNull(h2GIS.getSpatialTable("table1"));
+        assertNotNull(h2GIS.getSpatialTable("table1").getGeometricColumns());
+        assertNotNull(h2GIS.getTable("table1"));
+    }
 }
diff --git a/process-manager/src/main/java/org/orbisgis/processmanager/Process.java b/process-manager/src/main/java/org/orbisgis/processmanager/Process.java
index 482f751d..f26e7aac 100644
--- a/process-manager/src/main/java/org/orbisgis/processmanager/Process.java
+++ b/process-manager/src/main/java/org/orbisgis/processmanager/Process.java
@@ -213,24 +213,26 @@ private Object[] getClosureArgs(LinkedHashMap<String, Object> inputDataMap){
 
     @Override
     public boolean execute(LinkedHashMap<String, Object> inputDataMap) {
+        LinkedHashMap<String, Object> map = (inputDataMap == null ? new LinkedHashMap<>() : inputDataMap);
         if(closure == null){
             LOGGER.error("The process should have a Closure defined.");
             return false;
         }
         LOGGER.debug("Starting the execution of '" + this.getTitle() + "'.");
-        if(inputDataMap != null && (inputs.size() < inputDataMap.size() || inputs.size()-defaultValues.size() > inputDataMap.size())){
+        if((inputs.size() < map.size() || inputs.size()-defaultValues.size() > map.size())){
             LOGGER.error("The number of the input data map and the number of process input are different, should" +
-                    " be between " + (closure.getMaximumNumberOfParameters()-defaultValues.size()) + " and " + closure.getMaximumNumberOfParameters() + ".");
+                    " be between " + (closure.getMaximumNumberOfParameters()-defaultValues.size()) + " and " +
+                    closure.getMaximumNumberOfParameters() + ".");
             return false;
         }
         Object result;
         try {
             if(inputs.size() != 0) {
-                Closure cl = getClosureWithCurry(inputDataMap);
+                Closure cl = getClosureWithCurry(map);
                 if(cl == null){
                     return false;
                 }
-                result = cl.call(getClosureArgs(inputDataMap));
+                result = cl.call(getClosureArgs(map));
             }
             else {
                 result = closure.call();
diff --git a/process-manager/src/test/groovy/org/orbisgis/processmanager/TestProcess.groovy b/process-manager/src/test/groovy/org/orbisgis/processmanager/TestProcess.groovy
index 1898547e..c02bb0a4 100644
--- a/process-manager/src/test/groovy/org/orbisgis/processmanager/TestProcess.groovy
+++ b/process-manager/src/test/groovy/org/orbisgis/processmanager/TestProcess.groovy
@@ -480,5 +480,43 @@ class TestProcess {
         assertTrue mapper([inA2: "a"])
         assertEquals "tata", mapper.getResults().outB1
     }
+
+    @Test
+    void testOnlyOneOptionalInput() {
+        String[] arr = ["key1", "key2"]
+        def process = processManager.create()
+                .title("simple process")
+                .description("description")
+                .keywords("key1", "key2")
+                .inputs([inputA: ["key1", "key2"], inputB: String])
+                .outputs([outputA: String])
+                .version("version")
+                .run({ inputA, inputB -> [outputA: inputA] })
+                .process
+        assertTrue process.execute([inputB: String])
+        assertFalse process.results.isEmpty()
+        assertTrue process.results.containsKey("outputA")
+        assertEquals arr.join(""), process.results.outputA.join("")
+    }
+
+    @Test
+    void testBadTypeInput() {
+        String[] arr = ["key1", "key2"]
+        def process = processManager.create()
+                .title("simple process")
+                .description("description")
+                .keywords("key1", "key2")
+                .inputs([inputA: String[], inputB: "toto"])
+                .outputs([outputA: String])
+                .version("version")
+                .run({ inputA, inputB -> [outputA: inputA] })
+                .process
+        assertFalse process.execute([inputB: 56D])
+        assertTrue process.results.isEmpty()
+        //assertFalse process.execute([inputA: arr])
+        //assertTrue process.results.isEmpty()
+        assertTrue process.execute([inputA: ["key1", "key2"]])
+        assertFalse process.results.isEmpty()
+    }
 }