One of the `g_clear_pointer` calls wasn't replaced with `MozClearPointer`, but with `wl_callback_destroy` directly, removing the null check and allowing the function to be called with a null pointer. https://hg.mozilla.org/mozilla-central/file/9bdc06e5e8a29887c664d772751a5c4351c0307c/widget/gtk/MozContainerWayland.cpp#l247
Bug 1778767 Comment 9 Edit History
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One of the `g_clear_pointer` calls wasn't replaced with `MozClearPointer`, but with `wl_callback_destroy` directly, removing the null check and allowing the function to be called with a null pointer. https://hg.mozilla.org/mozilla-central/rev/cc1377cd7adb#l3.31