ERROR Cutline feature without a geometry

I am using QGIS 2.18.24. I’m trying to clip raster (asc) by mask (shp).
I’m working in EPSG:4326.

• I’m checking the geometry of the polygon file, no errors were found.
• Geometry is valid.
• Edit mode is disabled.

I’m always getting the following error message that I haven’t been able to sort out:

Algorithm Clip raster by mask layer starting...
GDAL command:
gdalwarp -ot Float32 -q -of GTiff -cutline C:UsersUrbanaDesktoptesiEuropa_shpEUROPA_OK.shp -co COMPRESS=DEFLATE -co PREDICTOR=1 -co ZLEVEL=6 -wo OPTIMIZE_SIZE=TRUE "C:UsersUrbanaDesktoptesivariabili currentNuova cartellabio01.asc" C:UsersUrbanaAppDataLocalTempprocessingf8e7cc09212f4e19a00d49110f0c0b1ca879020e1c284cfaabb238991ac727b1OUTPUT.tif
GDAL command output:
ERROR 1: Cutline feature without a geometry. 
Converting outputs
Caricamento layer

The following layers were not correctly generated.
Ritagliato (da maschera)
You can check the log messages to find more information about the execution of the algorithm