diff --git a/tests/base32_test.aer b/tests/base32_test.aer
index d5d1119..c85aa2e 100644
--- a/tests/base32_test.aer
+++ b/tests/base32_test.aer
@@ -54,14 +54,16 @@ class Base32 {
 			string $x = '';
 			if(!in_array($input[$i], Base32::$map))
 				return false;
-				for(int $j = 0; $j < 8; $j++) {
+			for(int $j = 0; $j < 8; $j++) {
+				if(array_key_exists($input[$i + $j], Base32::$flippedMap)) {
 					$x += str_pad(base_convert(Base32::$flippedMap[$input[$i + $j]], 10, 2), 5, '0', STR_PAD_LEFT);
 				}
-				string[] $eightBits = str_split($x, 8);
-				for(int $z = 0; $z < sizeof($eightBits); $z++) {
-					char $y;
-					$binaryString += (($y = chr(base_convert($eightBits[$z], 2, 10))) || ord($y) == 48) ? $y : '';
-				}
+			}
+			string[] $eightBits = str_split($x, 8);
+			for(int $z = 0; $z < sizeof($eightBits); $z++) {
+				char $y;
+				$binaryString += (($y = chr(base_convert($eightBits[$z], 2, 10))) || ord($y) == 48) ? $y : '';
+			}
 		}
 		return $binaryString;
 	}
diff --git a/tests/brainfuck_interpreter.aer b/tests/brainfuck_interpreter.aer
index 89c336e..e2914e1 100644
--- a/tests/brainfuck_interpreter.aer
+++ b/tests/brainfuck_interpreter.aer
@@ -22,7 +22,7 @@ class Brainfuck {
 	}
 
 	private void interpret(string $command) {
-		if(!$this->cells[$this->pointer]) {
+		if(!array_key_exists($this->pointer, $this->cells)) {
 			$this->cells[$this->pointer] = 0;
 		}
 		switch ($command) {
diff --git a/tests/goto_statement.aer b/tests/goto_statement.aer
index 9c68628..2184375 100644
--- a/tests/goto_statement.aer
+++ b/tests/goto_statement.aer
@@ -56,7 +56,7 @@ class Test {
 				goto cIterator;
 			}
 			cIteratorExit: {
-				if($headers[++$pos]) {
+				if(array_key_exists(++$pos, $headers)) {
 					goto hIterator;
 				}
 			}
diff --git a/tests/static_var.aer b/tests/static_var.aer
index 4335ea0..0c6971e 100644
--- a/tests/static_var.aer
+++ b/tests/static_var.aer
@@ -2,7 +2,7 @@ class Program {
 
 	private string cycle(char $a, char $b, int $i = 0) {
 		static bool[] $switches;
-		if($switches[$i])
+		if(array_key_exists($i, $switches))
 			$switches[$i] = !$switches[$i];
 		else
 			!($switches[$i] = true);