QGIS raster calculator error: cannot convert float infinity to integer

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I just made a simple subtraction between two raster layers and got the error:

Traceback (most recent call last): File "C:/Users/user/.qgis2/python/plugins\raster_transparency\rastertransparency.py", line 150, in layerChanged maxValue = int(stat.maximumValue) OverflowError: cannot convert float infinity to integer

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Both layers are Geotiff 32 bit pixel depth and floating point pixel type.

Is this a bug in the raster calculator or does anyone have suggestions to why I cannot subtract the two layers?Running QGIS 2.10.1



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