2 files changed, 7 insertions, 0 deletions
diff --git a/src/java/com/healthmarketscience/jackcess/Database.java b/src/java/com/healthmarketscience/jackcess/Database.java
index 3691e22..9156a46 100644
--- a/src/java/com/healthmarketscience/jackcess/Database.java
+++ b/src/java/com/healthmarketscience/jackcess/Database.java
@@ -2003,6 +2003,9 @@ public class Database
 
     private DefaultTableFinder(IndexCursor systemCatalogCursor) {
       _systemCatalogCursor = systemCatalogCursor;
+      if(_systemCatalogCursor.getIndex().getIndexData().isReadOnly()) {
+        throw new IllegalArgumentException("Unusable index");
+      }
     }
 
     @Override
diff --git a/src/java/com/healthmarketscience/jackcess/IndexData.java b/src/java/com/healthmarketscience/jackcess/IndexData.java
index 245bd84..87e23a7 100644
--- a/src/java/com/healthmarketscience/jackcess/IndexData.java
+++ b/src/java/com/healthmarketscience/jackcess/IndexData.java
@@ -322,6 +322,10 @@ public abstract class IndexData {
     _readOnly = true;
   }
 
+  protected boolean isReadOnly() {
+    return _readOnly;
+  }
+
   protected int getMaxPageEntrySize() {
     return _maxPageEntrySize;
   }