diff --git a/symmetric/symmetric-db/src/main/java/org/jumpmind/db/model/Table.java b/symmetric/symmetric-db/src/main/java/org/jumpmind/db/model/Table.java
index 78fb261d1f..0248ff4ae4 100644
--- a/symmetric/symmetric-db/src/main/java/org/jumpmind/db/model/Table.java
+++ b/symmetric/symmetric-db/src/main/java/org/jumpmind/db/model/Table.java
@@ -719,8 +719,10 @@ public Column[] getPrimaryKeyColumns() {
         if (columns != null) {
             List<Column> selectedColumns = new ArrayList<Column>();
             for (Column column : columns) {
-                if (column.isPrimaryKey()) {
-                    selectedColumns.add(column);
+                if (column != null) {
+                    if (column.isPrimaryKey()) {
+                        selectedColumns.add(column);
+                    }
                 }
             }
             return selectedColumns.toArray(new Column[selectedColumns.size()]);
@@ -966,7 +968,9 @@ public void orderColumns(String[] columnNames) {
         Column[] orderedColumns = orderColumns(columnNames, this);
         this.columns.clear();
         for (Column column : orderedColumns) {
-            this.columns.add(column);
+            if (column != null) {
+                this.columns.add(column);
+            }
         }
     }
 
@@ -976,7 +980,7 @@ public static Column[] orderColumns(String[] columnNames, Table table) {
         for (int i = 0; i < columnNames.length; i++) {
             String name = columnNames[i];
             for (Column column : unorderedColumns) {
-                if (column.getName().equalsIgnoreCase(name)) {
+                if (column != null && column.getName().equalsIgnoreCase(name)) {
                     orderedColumns[i] = column;
                     break;
                 }
@@ -985,7 +989,6 @@ public static Column[] orderColumns(String[] columnNames, Table table) {
         return orderedColumns;
     }
 
-    @SuppressWarnings("unchecked")
     public Table copy() {
         try {
             Table result = (Table) super.clone();
@@ -993,9 +996,24 @@ public Table copy() {
             result.schema = schema;
             result.name = name;
             result.type = type;
-            result.columns = (ArrayList<Column>) columns.clone();
-            result.foreignKeys = (ArrayList<ForeignKey>) foreignKeys.clone();
-            result.indices = (ArrayList<IIndex>) indices.clone();
+            result.columns = new ArrayList<Column>(columns.size());
+            for (Column col : columns) {
+                if (col != null) {
+                    result.columns.add((Column) col.clone());
+                }
+            }
+            result.foreignKeys = new ArrayList<ForeignKey>(foreignKeys.size());
+            for (ForeignKey fk : foreignKeys) {
+                if (fk != null) {
+                    result.foreignKeys.add((ForeignKey) fk.clone());
+                }
+            }
+            result.indices = new ArrayList<IIndex>(indices.size());
+            for (IIndex i : indices) {
+                if (i != null) {
+                    result.indices.add((IIndex) i.clone());
+                }
+            }
             return result;
         } catch (CloneNotSupportedException ex) {
             throw new RuntimeException(ex);
@@ -1005,18 +1023,22 @@ public Table copy() {
     public Table copyAndFilterColumns(String[] orderedColumnNames, String[] pkColumnNames,
             boolean setPrimaryKeys) {
         Table table = copy();
-        orderColumns(orderedColumnNames);
+        table.orderColumns(orderedColumnNames);
 
-        if (setPrimaryKeys) {
-            for (Column column : columns) {
-                column.setPrimaryKey(false);
+        if (setPrimaryKeys && columns != null) {
+            for (Column column : table.columns) {
+                if (column != null) {
+                    column.setPrimaryKey(false);
+                }
             }
 
             if (pkColumnNames != null) {
-                for (Column column : columns) {
-                    for (String pkColumnName : pkColumnNames) {
-                        if (column.getName().equals(pkColumnName)) {
-                            column.setPrimaryKey(true);
+                for (Column column : table.columns) {
+                    if (column != null) {
+                        for (String pkColumnName : pkColumnNames) {
+                            if (column.getName().equalsIgnoreCase(pkColumnName)) {
+                                column.setPrimaryKey(true);
+                            }
                         }
                     }
                 }
diff --git a/symmetric/symmetric-io/src/main/java/org/jumpmind/symmetric/io/data/writer/DatabaseWriter.java b/symmetric/symmetric-io/src/main/java/org/jumpmind/symmetric/io/data/writer/DatabaseWriter.java
index b58317d6f2..5d8078ee29 100644
--- a/symmetric/symmetric-io/src/main/java/org/jumpmind/symmetric/io/data/writer/DatabaseWriter.java
+++ b/symmetric/symmetric-io/src/main/java/org/jumpmind/symmetric/io/data/writer/DatabaseWriter.java
@@ -394,7 +394,7 @@ protected LoadStatus delete(CsvData data, boolean useConflictDetection) {
                             break;
                     }
                 }
-                
+
                 if (lookupKeys == null || lookupKeys.length == 0) {
                     lookupKeys = targetTable.getColumns();
                 }
@@ -501,11 +501,11 @@ protected LoadStatus update(CsvData data, boolean applyChangesOnly, boolean useC
                                 break;
                         }
                     }
-                    
+
                     if (lookupKeys == null || lookupKeys.length == 0) {
                         lookupKeys = targetTable.getColumns();
                     }
-                    
+
                     this.currentDmlStatement = platform
                             .createDmlStatement(DmlType.UPDATE, targetTable.getCatalog(),
                                     targetTable.getSchema(), targetTable.getName(), lookupKeys,
@@ -797,10 +797,12 @@ protected Table lookupTableAtTarget(Table sourceTable) {
 
                 Column[] columns = table.getColumns();
                 for (Column column : columns) {
-                    int typeCode = column.getMappedTypeCode();
-                    if (this.writerSettings.isTreatDateTimeFieldsAsVarchar()
-                            && (typeCode == Types.DATE || typeCode == Types.TIME || typeCode == Types.TIMESTAMP)) {
-                        column.setMappedTypeCode(Types.VARCHAR);
+                    if (column != null) {
+                        int typeCode = column.getMappedTypeCode();
+                        if (this.writerSettings.isTreatDateTimeFieldsAsVarchar()
+                                && (typeCode == Types.DATE || typeCode == Types.TIME || typeCode == Types.TIMESTAMP)) {
+                            column.setMappedTypeCode(Types.VARCHAR);
+                        }
                     }
                 }
             }