Fixed a bug which caused a segfault when debugging enabled and a NULL error handler was set

Author: kylef

libgeoffrey/helpers.c

@@ -45,10 +45,12 @@ void gb_pingSignal(geoffrey *g, char *message, void *data) {
 
 /* Put the signal into the error file (geoffrey.error). */
 void gb_debugSignal(geoffrey *g, char *message, char *data) {
- if (data == NULL) {
- fprintf(g->error, "[signal] (%s)\n", message);
- } else {
- fprintf(g->error, "[signal] (%s) %s\n", message, data);
+ if (g->error != NULL) {
+ if (data == NULL) {
+ fprintf(g->error, "[signal] (%s)\n", message);
+ } else {
+ fprintf(g->error, "[signal] (%s) %s\n", message, data);
+ }
  }
 }