fix: province index error

Author: annProg

libs/lpavatar.class.php

@@ -61,7 +61,11 @@ function getlp() {
 			$this->onerr();
 		}
 
-		$province = $this->province[$uid[3]%31-1];
+		$pindex = $uid[3]%31-1;
+		if ($pindex < 0 ) {
+			$pindex = 0;
+		}
+		$province = $this->province[$pindex];
 		$city = $this->city[$uid[3]%24];
 		$lp1 = $this->num[$uid[1]%34];
 		$lp2 = $this->num[$uid[2]/10];