From f3490f40bc47858a7aea8f9d045c9a12423d5702 Mon Sep 17 00:00:00 2001
From: spalmstr <spalmstr1@gmail.com>
Date: Tue, 21 Nov 2017 18:19:28 +0000
Subject: [PATCH] CRM-21001

---
 CRM/Core/BAO/SchemaHandler.php | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/CRM/Core/BAO/SchemaHandler.php b/CRM/Core/BAO/SchemaHandler.php
index efae63a64e..6cec729fad 100644
--- a/CRM/Core/BAO/SchemaHandler.php
+++ b/CRM/Core/BAO/SchemaHandler.php
@@ -713,6 +713,7 @@ MODIFY      {$columnName} varchar( $length )
     $requiredSigs = $existingSigs = array();
     // Get the indices defined (originally) in the xml files
     $requiredIndices = CRM_Core_DAO_AllCoreTables::indices();
+    $reqSigs = array();
     foreach ($requiredIndices as $table => $indices) {
       $reqSigs[] = CRM_Utils_Array::collect('sig', $indices);
     }
@@ -720,6 +721,7 @@ MODIFY      {$columnName} varchar( $length )
 
     // Get the indices in the database
     $existingIndices = CRM_Core_BAO_SchemaHandler::getIndexes(array_keys($requiredIndices));
+    $extSigs = array();
     foreach ($existingIndices as $table => $indices) {
       CRM_Core_BAO_SchemaHandler::addIndexSignature($table, $indices);
       $extSigs[] = CRM_Utils_Array::collect('sig', $indices);
@@ -747,10 +749,12 @@ MODIFY      {$columnName} varchar( $length )
     $missingIndices = array();
     foreach ($missingSigs as $sig) {
       $sigParts = explode('::', $sig);
-      foreach ($requiredIndices[$sigParts[0]] as $index) {
-        if ($index['sig'] == $sig) {
-          $missingIndices[$sigParts[0]][] = $index;
-          continue;
+      if (array_key_exists($sigParts[0], $requiredIndices)) {
+        foreach ($requiredIndices[$sigParts[0]] as $index) {
+          if ($index['sig'] == $sig) {
+            $missingIndices[$sigParts[0]][] = $index;
+            continue;
+          }
         }
       }
     }
-- 
2.25.1