fix issue #9
fix issue #9


Former-commit-id: a7678f74c8174752207e11843b421b4ceeb22fbb [formerly b42b8e99555f11a80d1f35d11a3250416a2a82c8] [formerly 11685195d291c0003e640851803d153024b398d4]
Former-commit-id: 563af6100ab5ede46ec3d412a2917b6bc35efca7
Former-commit-id: bf6b3ad1f1e5d9b7555b1baa2ff0ad3ad855a60b
DEIB-GECO/PyGMQL,DEIB-GECO/PyGMQL