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src/basic/basic.h

@@ -713,6 +713,11 @@ CircularArray<T> MakeCircularArray(Allocator allocator, int size) {
 
 template <class T>
 void Add(CircularArray<T> *arr, T item) {
+    if (arr->cap == 0) {
+        arr->allocator = GetSystemAllocator();
+        arr->cap       = 128;
+        arr->data      = AllocArray(arr->allocator, T, arr->cap);
+    }
     int idx    = arr->write;
     arr->write = (arr->write + 1) % arr->cap;
     if (arr->write == 0) arr->buffer_is_full = 1;