mysql issues

[brokiem]

Error: Call to a member function fetch_array() on bool
File: plugins/EconomyAPI_v3.0.0-SNAPSHOT-4f06e8d0.phar/src/onebone/economyapi/provider/MySQLProvider
Line: 116
Type: Error

THIS CRASH WAS CAUSED BY A PLUGIN
BAD PLUGIN: EconomyAPI v3.0.0-SNAPSHOT

Code:
[107] 	 * @return float|bool
[108] 	 */
[109] 	public function getMoney($player) {
[110] 		if($player instanceof Player) {
[111] 			$player = $player->getName();
[112] 		}
[113] 		$player = strtolower($player);
[114] 
[115] 		$res = $this->db->query("SELECT money FROM user_money WHERE username='" . $this->db->real_escape_string($player) . "'");
[116] 		$ret = $res->fetch_array()[0] ?? false;
[117] 		$res->free();
[118] 		return $ret;
[119] 	}
[120] 
[121] 	/**
[122] 	 * @param Player|string $player
[123] 	 * @param float $amount
[124] 	 * @return bool
[125] 	 */
[126] 	public function setMoney($player, float $amount): bool {