Address 0x0005 reference trace

This is a trace of the Apple II+ address lines 0 to 13, and the SYNC and PHI0 signals (top), around the only refernce to address 0x0005 it does before it crashes. Strangely, this reference is only a part of a LDA instruction at address 0xF88C (you can see SYNC signal is low, indicating that processor is NOT reading an op code). Execution continues normally after the reference at address 0xF88E.