Crashing while reading map, error log posted

[NorternWolf]

[string "MapMode.lua"]:0: attempt to perform arithmetic on field 'x' (a nil value)
stack traceback:
[string "MapMode.lua"]: in function 'updateMarkers'
[string "MapMode.lua"]: in function 'drawMap'
[string "MapMode.lua"]: in function 'update'
[string "GameMode.lua"]: in function 'update'
[string "Grimrock.lua"]: in function 'display'
[string "Grimrock.lua"]: in main chunk

OS Version 6.1

OEM ID: 0
Number of processors: 4
Page size: 4096
Processor type: 586

Total memory: 3766 MB
Free memory: 1301 MB

Display device 0:
Device name: \\.\DISPLAY1
Device string: Intel(R) Graphics Media Accelerator HD
State flags: 00000000

Display device 1:
Device name: \\.\DISPLAY2
Device string: Intel(R) Graphics Media Accelerator HD
State flags: 00000000

Display device 2:
Device name: \\.\DISPLAY3
Device string: ATI Mobility Radeon HD 5850
State flags: 00000005

Display device 3:
Device name: \\.\DISPLAY4
Device string: ATI Mobility Radeon HD 5850
State flags: 00000000

Display device 4:
Device name: \\.\DISPLAYV1
Device string: RDPDD Chained DD
State flags: 00200008

Display device 5:
Device name: \\.\DISPLAYV2
Device string: RDP Encoder Mirror Driver
State flags: 00200008

Display device 6:
Device name: \\.\DISPLAYV3
Device string: RDP Reflector Display Driver
State flags: 00200008


Something made that when reading the map the game crashes