Continue main loop only if p is non-null

src/main.c

@@ -15,6 +15,10 @@ int main (int argc, char* args[])
     }
 
     p = Pong_init();
+    if (p == NULL) {
+      printf("Pong failed to initialise!\n");
+      return 1;
+    }
     Pong_render(p);
 
     while (!start) {