I am trying to use the TIN interpolation to interpolate conductivities between a vector layer in QGIS 3.4. and I always get this error:

Traceback (most recent call last):
File "C:/PROGRA~1/QGIS3~1.4/apps/qgis/./python/plugins\processing\algs\qgis\TinInterpolation.py", line 171, in processAlgorithm
crs = layer.sourceCrs()
AttributeError: 'NoneType' object has no attribute 'sourceCrs'

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Does anyone have encountered this error already? I didn't find anything about it. The CRS is homogeneous in all my layers.

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