diff --git a/Documentation/doc/scripts/compare_testsuites.sh b/Documentation/doc/scripts/compare_testsuites.sh
index ec4e941e451..8196c30c548 100644
--- a/Documentation/doc/scripts/compare_testsuites.sh
+++ b/Documentation/doc/scripts/compare_testsuites.sh
@@ -40,8 +40,8 @@ cd ..
 echo "Output generated"
 if ! [ -d "$DOC_REF" ]; then
   echo "No reference given. Script is finished."
-  exit 2
+  exit 0
 fi
 
 #diff the output and the reference output, ignoring the differences in whitespaces
-diff -u -N -w ./doc_data $DOC_REF > ./diff.txt
+diff -u -N -w ./doc_data $DOC_REF > ./diff.txt || true
diff --git a/Documentation/doc/scripts/test_doxygen_versions.sh b/Documentation/doc/scripts/test_doxygen_versions.sh
index b8e3082d7db..d179c92b26f 100644
--- a/Documentation/doc/scripts/test_doxygen_versions.sh
+++ b/Documentation/doc/scripts/test_doxygen_versions.sh
@@ -47,7 +47,7 @@ make -j$NB_CORES doc  &> /dev/null
 echo "done."
 cd ../ #scripts
 echo "Creating text files for diff...."
-bash compare_testsuites.sh $PWD/build_doc/doc_output 1> /dev/null
+bash -$- compare_testsuites.sh $PWD/build_doc/doc_output 1> /dev/null
 mv ./doc_data ./doc_ref
 echo "done."
 
@@ -82,7 +82,7 @@ cd ../ #scripts
 DOXYGEN_1=$($PATH_TO_1 --version)
 DOXYGEN_2=$($PATH_TO_2 --version)
 echo "Comparing results..."
-bash ./compare_testsuites.sh $PWD/build_doc/doc_output $PWD/doc_ref 1> /dev/null
+bash -$- ./compare_testsuites.sh $PWD/build_doc/doc_output $PWD/doc_ref 1> /dev/null
 echo "done."
 #add post-processing
 cd ./build_doc