diff --git a/.travis.yml b/.travis.yml
index f52f76f..0dcec37 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,6 +9,7 @@ stages:
 php:
   - '7.2'
   - '7.3'
+  - '7.4'
 
 before_script:
   - java -Djava.library.path=./DynamoDBLocal_lib -jar dynamodb_local/DynamoDBLocal.jar --port 3000 &
diff --git a/src/ConditionAnalyzer/Analyzer.php b/src/ConditionAnalyzer/Analyzer.php
index 5ecba99..1d023e5 100644
--- a/src/ConditionAnalyzer/Analyzer.php
+++ b/src/ConditionAnalyzer/Analyzer.php
@@ -199,15 +199,13 @@ private function getIndex()
 
     private function hasValidQueryOperator($hash, $range = null)
     {
-        $hashCondition = $this->getCondition($hash);
-
-        $validQueryOp = ComparisonOperator::isValidQueryDynamoDbOperator($hashCondition['type'] ?? null);
+        $hashConditionType = $this->getCondition($hash)['type'] ?? null;
+        $validQueryOp = ComparisonOperator::isValidQueryDynamoDbOperator($hashConditionType);
 
         if ($validQueryOp && $range) {
-            $rangeCondition = $this->getCondition($range);
-
+            $rangeConditionType = $this->getCondition($range)['type'] ?? null;
             $validQueryOp = ComparisonOperator::isValidQueryDynamoDbOperator(
-                $rangeCondition['type'],
+                $rangeConditionType,
                 true
             );
         }