diff --git a/libs/utils/gtest/src/ConvertUtilsErrorInjectionTestSuite.cc b/libs/utils/gtest/src/ConvertUtilsErrorInjectionTestSuite.cc
index 63d6a8ff3..259362e97 100644
--- a/libs/utils/gtest/src/ConvertUtilsErrorInjectionTestSuite.cc
+++ b/libs/utils/gtest/src/ConvertUtilsErrorInjectionTestSuite.cc
@@ -114,7 +114,7 @@ TEST_F(ConvertUtilsWithErrorInjectionTestSuite, LongArrayToStringTest) {
 
     //Given an error injection for fputs
     celix_ei_expect_fputs((void*)celix_utils_arrayListToString, 1, -1);
-    //When calling celix_utils_longArrayListToString
+    //When calling celix_utils_arrayListToString
     result = celix_utils_arrayListToString(list);
     //Then the result is null
     EXPECT_EQ(nullptr, result);
@@ -137,6 +137,20 @@ TEST_F(ConvertUtilsWithErrorInjectionTestSuite, StringToStringArrayTest) {
     // Then the result is null and the status is ENOMEM
     EXPECT_EQ(status, CELIX_ENOMEM);
 
+    // Given an error injection for fputc
+    celix_ei_expect_fputc((void*)celix_utils_convertStringToStringArrayList, 1, EOF, 2);
+    // When calling celix_utils_convertStringToStringArrayList
+    status = celix_utils_convertStringToStringArrayList("a,b,c", nullptr, &result);
+    // Then the result is null and the status is ENOMEM
+    EXPECT_EQ(status, CELIX_ENOMEM);
+
+    // Given an error injection for fputc
+    celix_ei_expect_fputc((void*)celix_utils_convertStringToStringArrayList, 1, EOF, 6);
+    // When calling celix_utils_convertStringToStringArrayList
+    status = celix_utils_convertStringToStringArrayList("a,b,c", nullptr, &result);
+    // Then the result is null and the status is ENOMEM
+    EXPECT_EQ(status, CELIX_ENOMEM);
+
     // Given an error injection for fputc (on writing an escaped char)
     celix_ei_expect_fputc((void*)celix_utils_convertStringToStringArrayList, 1, EOF);
     // When calling celix_utils_convertStringToStringArrayList
@@ -144,3 +158,22 @@ TEST_F(ConvertUtilsWithErrorInjectionTestSuite, StringToStringArrayTest) {
     // Then the result is null and the status is ENOMEM
     EXPECT_EQ(status, CELIX_ENOMEM);
 }
+
+TEST_F(ConvertUtilsWithErrorInjectionTestSuite, StringArrayToStringTest) {
+    celix_autoptr(celix_array_list_t) list = celix_arrayList_createStringArray();
+    celix_arrayList_addString(list, ",hello");
+    celix_arrayList_addString(list, "world");
+
+    //Given an error injection for fputc
+    celix_ei_expect_fputc((void*)celix_utils_arrayListToString, 2, -1);
+    //When calling celix_utils_arrayListToString
+    char* result = celix_utils_arrayListToString(list);
+    //Then the result is null
+    EXPECT_EQ(nullptr, result);
+
+    celix_ei_expect_fputc((void*)celix_utils_arrayListToString, 2, -1, 2);
+    //When calling celix_utils_arrayListToString
+    result = celix_utils_arrayListToString(list);
+    //Then the result is null
+    EXPECT_EQ(nullptr, result);
+}
diff --git a/libs/utils/gtest/src/ConvertUtilsTestSuite.cc b/libs/utils/gtest/src/ConvertUtilsTestSuite.cc
index d0b402ba2..d3e8658cb 100644
--- a/libs/utils/gtest/src/ConvertUtilsTestSuite.cc
+++ b/libs/utils/gtest/src/ConvertUtilsTestSuite.cc
@@ -322,6 +322,10 @@ TEST_F(ConvertUtilsTestSuite, ConvertToLongArrayTest) {
     EXPECT_EQ(CELIX_ILLEGAL_ARGUMENT, convertState);
     EXPECT_TRUE(result == nullptr);
 
+    convertState = celix_utils_convertStringToLongArrayList(nullptr, nullptr, &result);
+    EXPECT_EQ(CELIX_ILLEGAL_ARGUMENT, convertState);
+    EXPECT_TRUE(result == nullptr);
+
     celix_autoptr(celix_array_list_t) defaultList = celix_arrayList_create();
     celix_arrayList_addLong(defaultList, 42L);
     convertState = celix_utils_convertStringToLongArrayList("1,2,3,invalid", defaultList, &result);
@@ -384,6 +388,10 @@ TEST_F(ConvertUtilsTestSuite, ConvertToDoubleArrayList) {
     EXPECT_DOUBLE_EQ(5.0, celix_arrayList_getDouble(result, 4));
     celix_arrayList_destroy(result);
 
+    convertState = celix_utils_convertStringToDoubleArrayList("0.1,invalid,3.1,4,5", nullptr, &result);
+    EXPECT_EQ(CELIX_ILLEGAL_ARGUMENT, convertState);
+    EXPECT_TRUE(result == nullptr);
+
     // NOTE celix_utils_convertStringToDoubleArrayList uses the same generic function as is used in
     // celix_utils_convertStringToLongArrayList and because celix_utils_convertStringToLongArrayList is already
     // tested, we only test a few cases here.
@@ -417,6 +425,10 @@ TEST_F(ConvertUtilsTestSuite, ConvertToBoolArrayList) {
     EXPECT_TRUE(celix_arrayList_getBool(result, 2));
     celix_arrayList_destroy(result);
 
+   convertState = celix_utils_convertStringToBoolArrayList("true,invalid,true", nullptr, &result);
+    EXPECT_EQ(CELIX_ILLEGAL_ARGUMENT, convertState);
+    EXPECT_TRUE(result == nullptr);
+
     // NOTE celix_utils_convertStringToBoolArrayList uses the same generic function as is used in
     // celix_utils_convertStringToLongArrayList and because celix_utils_convertStringToLongArrayList is already
     // tested, we only test a few cases here.
@@ -515,6 +527,10 @@ TEST_F(ConvertUtilsTestSuite, ConvertToVersionArrayList) {
     checkVersion(celix_arrayList_getVersion(result, 2), 3, 4, 5, "qualifier");
     celix_arrayList_destroy(result);
 
+    convertState = celix_utils_convertStringToVersionArrayList("1.2.3,invalid,3.4.5.qualifier", nullptr, &result);
+    EXPECT_EQ(CELIX_ILLEGAL_ARGUMENT, convertState);
+    EXPECT_TRUE(result == nullptr);
+
     // NOTE celix_utils_convertStringToVersionArrayList uses the same generic function as is used in
     // celix_utils_convertStringToLongArrayList and because celix_utils_convertStringToLongArrayList is already
     // tested, we only test a few cases here.