Every time i try to load up my world, the game crashes with this crash report. My world crashed as soon as i tried to open a map i found in a cartographers house. Here it is, 

The game crashed whilst ticking player
Error: java.lang.IllegalArgumentException: Cannot get property cdt{name=axis, clazz=class fr$a, values=[x, y, z]} as it does not exist in Block{minecraft:dark_oak_sign}