Fix my own stupidity.

source/intersect.cpp

@@ -34,11 +34,14 @@ Intersect::~Intersect()
     int i;
     for(i = 0; i < this->num; i++)
     {
-        free(this->list[i]);
+        delete this->list[i];
     }
     /* Free stuff */
+    if (this->list != nullptr)
+    {
         free(this->list);
     }
+}
 
 void Intersect::reset()
 {