diff --git a/rc b/rc
index 659dec8..c48b680 100755
--- a/rc
+++ b/rc
@@ -38,18 +38,20 @@ function _q-tools-update-binary {
     local remote_version
     current_version=$( cat "$QTOOLSPATH"/.version )
     remote_version=$( curl -f -s -L https://six9.net/software/q-tools/current.txt )
-    if [[ "$remote_version" != "$current_version" ]]; then
-        set -u
-        echo "Update $current_version => $remote_version"
-        mkdir -p "$QTOOLSPATH"
-        find "$QTOOLSPATH" -maxdepth 1 -mindepth 1 -type d -exec rm -r \{\} \;
-        curl -L -f -s https://six9.net/software/q-tools/current.tar.gz | \
-          tar xz -C "$QTOOLSPATH"
-        set +u
+    if [[ -n "$remote_version" ]]; then
+        if [[ "$remote_version" != "$current_version" ]]; then
+            set -u
+            echo "Update $current_version => $remote_version"
+            mkdir -p "$QTOOLSPATH"
+            find "$QTOOLSPATH" -maxdepth 1 -mindepth 1 -type d -exec rm -r \{\} \;
+            curl -L -f -s https://six9.net/software/q-tools/current.tar.gz | \
+              tar xz -C "$QTOOLSPATH"
+            set +u
+        fi
     fi
     popd > /dev/null
     _q-tools-reload
-    
+
 }
 
 function _self_update() {