Segfault when FMDispose after FME_IMPLIED_DEFTEMPLATE_ERROR

[Ryan Johnston]

The following code causes a segfault:

   mainEnv = CreateEnvironment();

   Fact *f = AssertString(mainEnv, "(foo)");
   FactModifier *fm = CreateFactModifier(mainEnv, f);
   FMModify(fm);
   printf("FMError: %d\n", FMError(mainEnv));
   FMDispose(fm);

[CLIPS Support]

CreateFactModifier returns a null pointer for implied deftemplate facts and sets the error to  FME_IMPLIED_DEFTEMPLATE_ERROR. Unless the documentation specifically indicates that null pointers are acceptable as parameter values, you shouldn't pass them to functions expecting a pointer to a data structure.

[Ryan Johnston]

Got it! Thank you.