diff --git a/llx/builtin_map.go b/llx/builtin_map.go
index 6db4fe1161..3184232a54 100644
--- a/llx/builtin_map.go
+++ b/llx/builtin_map.go
@@ -783,7 +783,10 @@ func dictDifferenceV2(e *blockExecutor, bind *RawData, chunk *Chunk, ref uint64)
 		return &RawData{Type: bind.Type, Error: errors.New("cannot compute difference of lists, argument is not a list")}, 0, nil
 	}
 
-	filters := arg.Value.([]interface{})
+	filters, ok := arg.Value.([]interface{})
+	if !ok {
+		return &RawData{Type: bind.Type, Error: errors.New("tried to call function with a non-array, please make sure the argument is an array")}, 0, nil
+	}
 
 	var res []interface{}
 	var skip bool
diff --git a/resources/packs/core/core_test.go b/resources/packs/core/core_test.go
index 124f3529ef..b2bd59608c 100644
--- a/resources/packs/core/core_test.go
+++ b/resources/packs/core/core_test.go
@@ -1101,6 +1101,18 @@ func TestDict_Methods_Contains(t *testing.T) {
 			p + "params['string-array'].contains('a')",
 			1, true,
 		},
+		{
+			p + "params['string-array'].containsOnly(['c', 'a', 'b'])",
+			1, true,
+		},
+		{
+			p + "params['string-array'].containsOnly(['a', 'b'])",
+			1, false,
+		},
+		// {
+		// 	p + "params['string-array'].containsOnly('a')",
+		// 	1, false,
+		// },
 		{
 			p + "params['string-array'].none('a')",
 			1, false,