diff -u b/src/Plugin/migrate/process/EntityGenerate.php b/src/Plugin/migrate/process/EntityGenerate.php
--- b/src/Plugin/migrate/process/EntityGenerate.php
+++ b/src/Plugin/migrate/process/EntityGenerate.php
@@ -98,12 +98,12 @@
       throw new MigrateException('The entity_generate plugin found no bundle but destination entity requires one.');
     }
 
-    // Creates a stub entity if one doesn't exist.
-    if (!($result = $this->query($value, $bundle))) {
+    // Creates a stub entity if one doesn't exist and stubbing isn't disabled.
+    if (!($result = $this->query($value, $bundle)) && empty($this->configuration['no_stub'])) {
       return $this->generateEntity($value, $bundle);
     }
 
-    return $result;
+    return $result ?: NULL;
   }
 
 
@@ -130,13 +130,11 @@
     }
     $results = $query->execute();
 
-    if ($ignoreCase) {
+    // By default do a case-sensitive comparison.
+    if (!$ignoreCase) {
       // Returns the entity's identifier.
-      $valueLower = strtolower($value);
-      $identifiers = $this->entityManager->getStorage($this->entityType)->loadMultiple($results);
-
-      foreach ($identifiers as $identifier  => $entity) {
-        if ($valueLower == strtolower($entity->{$this->valueKey}->value())) {
+      foreach ($this->entityManager->getStorage($this->entityType)->loadMultiple($results) as $identifier  => $entity) {
+        if ($value === $entity->{$this->valueKey}->value()) {
           return $identifier;
         }
       }