diff --git a/python/core/auto_generated/processing/qgsprocessingutils.sip.in b/python/core/auto_generated/processing/qgsprocessingutils.sip.in
index 4a52163d2597..63070e628422 100644
--- a/python/core/auto_generated/processing/qgsprocessingutils.sip.in
+++ b/python/core/auto_generated/processing/qgsprocessingutils.sip.in
@@ -711,7 +711,18 @@ Returns an expression context scope suitable for this source.
 %Docstring
 Overrides the default geometry check method for the source.
 
+.. seealso:: :py:func:`invalidGeometryCheck`
+
 .. versionadded:: 3.14
+%End
+
+    QgsFeatureRequest::InvalidGeometryCheck invalidGeometryCheck() const;
+%Docstring
+Returns the geometry check method for the source.
+
+.. seealso:: :py:func:`setInvalidGeometryCheck`
+
+.. versionadded:: 3.36
 %End
 
 };
diff --git a/src/analysis/processing/qgsalgorithmcoveragesimplify.cpp b/src/analysis/processing/qgsalgorithmcoveragesimplify.cpp
index 5a827a5f3134..95d8a19b1be4 100644
--- a/src/analysis/processing/qgsalgorithmcoveragesimplify.cpp
+++ b/src/analysis/processing/qgsalgorithmcoveragesimplify.cpp
@@ -123,10 +123,26 @@ QVariantMap QgsCoverageSimplifyAlgorithm::processAlgorithm( const QVariantMap &p
     current++;
   }
 
+  QString error;
+  QgsGeos geos( &collection );
+  switch ( source->invalidGeometryCheck() )
+  {
+    case QgsFeatureRequest::GeometryNoCheck:
+      break;
+
+    case QgsFeatureRequest::GeometrySkipInvalid:
+    case QgsFeatureRequest::GeometryAbortOnInvalid:
+    {
+      if ( geos.validateCoverage( 0, nullptr, &error ) != Qgis::CoverageValidityResult::Valid )
+      {
+        throw QgsProcessingException( QObject::tr( "Coverage is not valid" ) );
+      }
+      break;
+    }
+  }
+
   feedback->pushInfo( QObject::tr( "Simplifying coverage" ) );
 
-  QgsGeos geos( &collection );
-  QString error;
   std::unique_ptr< QgsAbstractGeometry > simplified;
   try
   {
diff --git a/src/analysis/processing/qgsalgorithmcoverageunion.cpp b/src/analysis/processing/qgsalgorithmcoverageunion.cpp
index 4f00112b0268..766814a2dc5a 100644
--- a/src/analysis/processing/qgsalgorithmcoverageunion.cpp
+++ b/src/analysis/processing/qgsalgorithmcoverageunion.cpp
@@ -113,6 +113,23 @@ QVariantMap QgsCoverageUnionAlgorithm::processAlgorithm( const QVariantMap &para
 
   QgsGeos geos( &collection );
   QString error;
+
+  switch ( source->invalidGeometryCheck() )
+  {
+    case QgsFeatureRequest::GeometryNoCheck:
+      break;
+
+    case QgsFeatureRequest::GeometrySkipInvalid:
+    case QgsFeatureRequest::GeometryAbortOnInvalid:
+    {
+      if ( geos.validateCoverage( 0, nullptr, &error ) != Qgis::CoverageValidityResult::Valid )
+      {
+        throw QgsProcessingException( QObject::tr( "Coverage is not valid" ) );
+      }
+      break;
+    }
+  }
+
   std::unique_ptr< QgsAbstractGeometry > dissolved = geos.unionCoverage( &error );
 
   if ( !dissolved )
diff --git a/src/core/processing/qgsprocessingutils.cpp b/src/core/processing/qgsprocessingutils.cpp
index f00301f15f60..65491ba66f04 100644
--- a/src/core/processing/qgsprocessingutils.cpp
+++ b/src/core/processing/qgsprocessingutils.cpp
@@ -1849,6 +1849,11 @@ void QgsProcessingFeatureSource::setInvalidGeometryCheck( QgsFeatureRequest::Inv
   }
 }
 
+QgsFeatureRequest::InvalidGeometryCheck QgsProcessingFeatureSource::invalidGeometryCheck() const
+{
+  return mInvalidGeometryCheck;
+}
+
 
 //
 // QgsProcessingFeatureSink
diff --git a/src/core/processing/qgsprocessingutils.h b/src/core/processing/qgsprocessingutils.h
index 5ef0851ac8c1..3ab450939694 100644
--- a/src/core/processing/qgsprocessingutils.h
+++ b/src/core/processing/qgsprocessingutils.h
@@ -730,10 +730,19 @@ class CORE_EXPORT QgsProcessingFeatureSource : public QgsFeatureSource
     /**
      * Overrides the default geometry check method for the source.
      *
+     * \see invalidGeometryCheck()
      * \since QGIS 3.14
      */
     void setInvalidGeometryCheck( QgsFeatureRequest::InvalidGeometryCheck method );
 
+    /**
+     * Returns the geometry check method for the source.
+     *
+     * \see setInvalidGeometryCheck()
+     * \since QGIS 3.36
+     */
+    QgsFeatureRequest::InvalidGeometryCheck invalidGeometryCheck() const;
+
   private:
 
     QgsFeatureSource *mSource = nullptr;