diff --git a/includes/dbtypes/spell.class.php b/includes/dbtypes/spell.class.php
index 032f0e6b..9ab553a8 100644
--- a/includes/dbtypes/spell.class.php
+++ b/includes/dbtypes/spell.class.php
@@ -623,6 +623,10 @@ class SpellList extends DBTypeList
         $pps  = $this->curTpl['powerPerSecond'];
         $pcpl = $this->curTpl['powerCostPerLevel'];
 
+        // some potion effects have this set, but it's not displayed by client (or enforced by core)
+        if ($pt == POWER_HAPPINESS)
+            return '';
+
         if ($pt == POWER_RAGE || $pt == POWER_RUNIC_POWER)
             $pc /= 10;