diff --git a/AdminGroups/scripting/AdminGroups.sp b/AdminGroups/scripting/AdminGroups.sp
index bde0e9f..3888845 100644
--- a/AdminGroups/scripting/AdminGroups.sp
+++ b/AdminGroups/scripting/AdminGroups.sp
@@ -308,7 +308,7 @@ public int Native_RevokeAdminGroup(Handle hPlugin, int numParams)
 	}
 
 	int clientGroupIndex;
-	if ((clientGroupIndex = G_hArray_ClientGroups[client].FindString(group)) != -1)
+	if ((clientGroupIndex = G_hArray_ClientGroups[client].FindString(group)) == -1)
 	{
 		ThrowNativeError(SP_ERROR_NATIVE, "Client doesnt have group. (%s) [%d]", group, clientGroupIndex);
 		return;