Fix an error in debug mode

Author: adonis0147

.gitignore

@@ -1,4 +1,5 @@
 build
 tags
 .DS_Store
+.ycm_extra_conf.py
 

BehaviorTree/include/node.h

@@ -50,6 +50,15 @@ class Node {
 		delete[] children_;
 		children_ = NULL;
 		size_ = 0;
+
+#ifdef Py_DEBUG
+		// The process terminates and the destruction is called by static variable's destructor(~NodeManager()).
+		// The Python interpreter is finalized at the moment.
+		if (!Py_IsInitialized()) {
+			return;
+		}
+#endif
+
 		Py_XDECREF(function_);
 		function_ = NULL;
 	}