diff --git a/src/c2pa/c2pa.py b/src/c2pa/c2pa.py
index 7d920e6..c8524bc 100644
--- a/src/c2pa/c2pa.py
+++ b/src/c2pa/c2pa.py
@@ -1123,9 +1123,14 @@ def flush_callback(ctx):
         self._write_cb = WriteCallback(write_callback)
         self._flush_cb = FlushCallback(flush_callback)
 
+        # Create a placeholder context as we don't actually use the context,
+        # but we need having a valid context pointer. Therefore, we create
+        # a small buffer and cast it to a StreamContext pointer
+        self._context = ctypes.create_string_buffer(1)
+
         # Create the stream
         self._stream = _lib.c2pa_create_stream(
-            None,  # context
+            ctypes.cast(self._context, ctypes.POINTER(StreamContext)),
             self._read_cb,
             self._seek_cb,
             self._write_cb,