With all Points
	Loading resulting layers
	Algorithm 'Generate Contours' finished
	Processing algorithm…
	Algorithm 'Generate Contours' starting…
	Input parameters:
	{ 'ContourInterval' : 100, 'ContourLevels' : '', 'ContourMethod' : 0, 'ContourType' : 0, 'DuplicatePointTolerance' : 100, 'ExtendOption' : 0, 'InputField' : 'CASE WHEN \"topsTOP\" is not null and \"topsELEVATION\" is not null and \"topsFORMATION\" Like \'%Prec%\' THEN \"topsELEVATION\" - \"topsTOP\" END', 'InputLayer' : 'C:/Users/jesco/OneDrive/Documents/GIS Data/Project Files/USA/Kansas/Culture Data/Oil and Gas Wells/OILGAS_WELLS_GEO27.shp', 'LabelDecimalPlaces' : 0, 'LabelTrimZeros' : False, 'LabelUnits' : '', 'MaxContourValue' : None, 'MinContourValue' : None, 'NContour' : 200, 'OutputLayer' : 'memory:' }

	Traceback (most recent call last):
	File "C:/Users/jesco/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\contour\ContourGeneratorAlgorithm.py", line 326, in processAlgorithm
	for feature in generator.contourFeatures():
	File "C:/Users/jesco/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\contour\ContourGenerator.py", line 500, in lineContourFeatures
	x,y,z=self.data()
	File "C:/Users/jesco/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\contour\ContourGenerator.py", line 291, in data
	zval=float(zval)
	TypeError: float() argument must be a string or a number, not 'NoneType'

	Execution failed after 0.01 seconds



With Nulls excluded via Selection
	Loading resulting layers
	Algorithm 'Generate Contours' finished
	Processing algorithm…
	Algorithm 'Generate Contours' starting…
	Input parameters:
	{ 'ContourInterval' : 100, 'ContourLevels' : '', 'ContourMethod' : 0, 'ContourType' : 0, 'DuplicatePointTolerance' : 100, 'ExtendOption' : 0, 'InputField' : 'CASE WHEN \"topsTOP\" is not null and \"topsELEVATION\" is not null and \"topsFORMATION\" Like \'%Prec%\' THEN \"topsELEVATION\" - \"topsTOP\" END', 'InputLayer' : QgsProcessingFeatureSourceDefinition('OILGAS_WELLS_GEO27_709bae64_efb3_4943_b7e1_c06eade60676', True), 'LabelDecimalPlaces' : 0, 'LabelTrimZeros' : False, 'LabelUnits' : '', 'MaxContourValue' : None, 'MinContourValue' : None, 'NContour' : 200, 'OutputLayer' : 'memory:' }

	2 near duplicate points discarded - tolerance 100.0
	Triangulating 67 points
	Contouring 123 triangles
	Execution completed in 0.20 seconds
	Results:
	{'OutputLayer': 'output_1ccf374a_596f_4014_bc8d_f8c8f290ddcf'}