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-rw-r--r--debian/preinst2
1 files changed, 1 insertions, 1 deletions
diff --git a/debian/preinst b/debian/preinst
index 7a7b135..13351fc 100644
--- a/debian/preinst
+++ b/debian/preinst
@@ -1,6 +1,6 @@
#!/bin/sh -e
-if dpkg --compare-versions "$2" le "2018.01.29~"; then
+if [ -n "$2" ] && dpkg --compare-versions "$2" le "2018.01.29~"; then
if which apt-key >/dev/null; then
# ITZkS key directly imported to main keyring
echo -n "Updating APT keyring - " && apt-key del 0xCBBFF2FC3F8F5540 || true