810b2fb78d89b24de7f35ca8429e384ab5125a22
We accomplish this by explicitly setting the global_obs to NULL after free'ing it. The crash that led to this fix can be replicated as such $ sendosc localhost 3819 /set_surface i 8 i 159 i 8 $ sendosc localhost 3819 /set_surface i 0 i 0 i 0 $ sendosc localhost 3819 /set_surface i 0 i 0 i 0 In this example the observer is created, then free'd, and then free'd *again* because the new observer was never made (sur->feedback[x] checks fail)
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