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The game keeps crashing on me. The game errors log reads: 

ERROR in
action number 16
of  Step Event
for object Control:

Error in code at line 3:
   
if biome_lighting[area_biome]="normal" then light_daynight()
                                 ^
at position 32: Cannot compare arguments.

ERROR in
action number 16
of  Step Event
for object Control:

Error in code at line 3:
   
if biome_lighting[area_biome]="normal" then light_daynight()
                                 ^
at position 32: Cannot compare arguments.