diff --git a/generate-config.sh b/generate-config.sh
index b1e705fc481312461439a2994908fe47199f5d70..fc4981853f787d0f5d919d3f3609047e3ba58606 100644
--- a/generate-config.sh
+++ b/generate-config.sh
@@ -35,7 +35,18 @@ for i in $1/*.yaml ;  do
 	echo "[$i]" | grep -Po "TS[\w-]+\.yaml" | xargs -I % sh -c 'echo [%]' >> api-versions.txt ;
     node ./scripts/node_modules/js-yaml/bin/js-yaml $i > "$i.json" ;
     cat "$i.json" | node ./scripts/node_modules/json/lib/json info.version >> api-versions.txt
-    cat "$i.json" | node ./scripts/node_modules/json/lib/json externalDocs.description | grep -Po "[0-9]+[.][0-9]+[.][0-9]+" >> api-versions.txt
+
+    input=$(cat "$i.json" | node ./scripts/node_modules/json/lib/json externalDocs.description)
+    pattern="[0-9]+[.][0-9]+[.][0-9]+"
+    if echo $input | grep -qPo $pattern
+    then
+      echo $input | grep -Po $pattern >> api-versions.txt
+    else
+      echo "-" >> api-versions.txt
+    fi
+
+    # cat "$i.json" | node ./scripts/node_modules/json/lib/json externalDocs.description | grep -Po "[0-9]+[.][0-9]+[.][0-9]+" >> api-versions.txt
+
     cat "$i.json" | node ./scripts/node_modules/json/lib/json info.description | grep -Po "[0-9]{4}" >> api-versions.txt
     res=$?
     fres=$(($fres||$res))