diff --git a/library/ZendSearch/Lucene/Search/Query/MultiTerm.php b/library/ZendSearch/Lucene/Search/Query/MultiTerm.php
index d3f71db..9efe3c3 100644
--- a/library/ZendSearch/Lucene/Search/Query/MultiTerm.php
+++ b/library/ZendSearch/Lucene/Search/Query/MultiTerm.php
@@ -453,13 +453,16 @@ public function _conjunctionScore($docId, Lucene\SearchIndexInterface $reader)
         $score = 0.0;
 
         foreach ($this->_terms as $termId => $term) {
-            /**
-             * We don't need to check that term freq is not 0
-             * Score calculation is performed only for matched docs
-             */
-            $score += $reader->getSimilarity()->tf($this->_termsFreqs[$termId][$docId]) *
-                      $this->_weights[$termId]->getValue() *
-                      $reader->norm($docId, $term->field);
+             // Check if term is matched
+            if (isset($this->_termsFreqs[$termId][$docId])) {
+                /**
+                 * We don't need to check that term freq is not 0
+                 * Score calculation is performed only for matched docs
+                 */
+                $score += $reader->getSimilarity()->tf($this->_termsFreqs[$termId][$docId]) *
+                          $this->_weights[$termId]->getValue() *
+                          $reader->norm($docId, $term->field);
+            }
         }
 
         return $score * $this->_coord * $this->getBoost();