You have a lightning effect that doesn't have any of the lightning properties defined:
Rendering layer effect for frame 984 of Arch7, layer 0.
BUTTON_Palette1=#FF0000,BUTTON_Palette2=#00FF00,BUTTON_Palette3=#0000FF,BUTTON_Palette4=#FFFF00,BUTTON_Palette5=#FFFFFF,BUTTON_Palette6=#000000,CHECKBOX_LayerMorph=0,CHECKBOX_OverlayBkg=0,CHECKBOX_Palette1=0,CHECKBOX_Palette2=0,CHECKBOX_Palette3=0,CHECKBOX_Palette4=0,CHECKBOX_Palette5=1,CHECKBOX_Palette6=1,CHOICE_LayerMethod=Normal,Effect=Lightning,SLIDER_Brightness=100,SLIDER_Contrast=0,SLIDER_EffectLayerMix=0,SLIDER_SparkleFrequency=0,TEXTCTRL_Fadein=0.00,TEXTCTRL_Fadeout=0.00
That's causing the crash. I've updated the code to defend agains that (so if #bolts is 0, make it 1, etc...) so next build won't crash, but I'm kind of curious how that lightning effect was created.