common: tree: Avoid a nullptr dereference.
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@ -322,7 +322,7 @@ void RB_INSERT_COLOR(RBHead<Node>* head, Node* elm) {
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template <typename Node>
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void RB_REMOVE_COLOR(RBHead<Node>* head, Node* parent, Node* elm) {
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Node* tmp;
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while ((elm == nullptr || RB_IS_BLACK(elm)) && elm != head->Root()) {
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while ((elm == nullptr || RB_IS_BLACK(elm)) && elm != head->Root() && parent != nullptr) {
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if (RB_LEFT(parent) == elm) {
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tmp = RB_RIGHT(parent);
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if (RB_IS_RED(tmp)) {
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