diff --git a/app/models/normalize_primo_record.rb b/app/models/normalize_primo_record.rb
index cb15beb0..cb1331dd 100644
--- a/app/models/normalize_primo_record.rb
+++ b/app/models/normalize_primo_record.rb
@@ -184,6 +184,9 @@ def doi
     if @record['pnx']['addata']['doi'].length > 1
       Sentry.set_tags('mitlib.recordId': identifier || 'empty record id')
       Sentry.capture_message('Multiple DOIs found in one record')
+
+      # Exit method to avoid ambiguous LibKey lookups.
+      return
     end
 
     @record['pnx']['addata']['doi'].first
@@ -195,6 +198,9 @@ def pmid
     if @record['pnx']['addata']['pmid'].length > 1
       Sentry.set_tags('mitlib.recordId': identifier || 'empty record id')
       Sentry.capture_message('Multiple PMIDs found in one record')
+
+      # Exit method to avoid ambiguous LibKey lookups.
+      return
     end
 
     @record['pnx']['addata']['pmid'].first
diff --git a/test/models/normalize_primo_record_test.rb b/test/models/normalize_primo_record_test.rb
index c234d5ae..1fb4fd99 100644
--- a/test/models/normalize_primo_record_test.rb
+++ b/test/models/normalize_primo_record_test.rb
@@ -142,13 +142,13 @@ def cdi_record
     assert_nil normalized[:doi]
   end
 
-  test 'multiple dois normalize to the first one' do
+  test 'multiple dois are ignored' do
     temp_record = full_record
     temp_record['pnx']['addata']['doi'] = %w[three two one]
 
     normalized = NormalizePrimoRecord.new(temp_record, 'test').normalize
 
-    assert_equal normalized[:doi], 'three'
+    assert_nil normalized[:doi]
   end
 
   test 'normalizes pmid' do
@@ -161,13 +161,13 @@ def cdi_record
     assert_nil normalized[:pmid]
   end
 
-  test 'multiple pmids normalize to the first one' do
+  test 'multiple pmids are ignored' do
     temp_record = full_record
     temp_record['pnx']['addata']['pmid'] = %w[three two one]
 
     normalized = NormalizePrimoRecord.new(temp_record, 'test').normalize
 
-    assert_equal normalized[:pmid], 'three'
+    assert_nil normalized[:pmid]
   end
 
   test 'normalizes summary' do