diff --git a/src/00/z2ui5_cl_util_func.clas.abap b/src/00/z2ui5_cl_util_func.clas.abap
index a66ba614..aacbdb2e 100644
--- a/src/00/z2ui5_cl_util_func.clas.abap
+++ b/src/00/z2ui5_cl_util_func.clas.abap
@@ -912,9 +912,15 @@ CLASS z2ui5_cl_util_func IMPLEMENTATION.
 
         FIELD-SYMBOLS <any> TYPE any.
         ASSIGN obj->('IF_XCO_AO_INTERFACE~IMPLEMENTATIONS') TO <any>.
+        IF sy-subrc <> 0.
+          RAISE EXCEPTION TYPE cx_sy_dyn_call_illegal_class.
+        ENDIF.
         obj = <any>.
 
         ASSIGN obj->('IF_XCO_INTF_IMPLEMENTATIONS_FC~ALL') TO <any>.
+        IF sy-subrc <> 0.
+          RAISE EXCEPTION TYPE cx_sy_dyn_call_illegal_class.
+        ENDIF.
         obj = <any>.
 
         CALL METHOD obj->('IF_XCO_INTF_IMPLEMENTATIONS~GET').