diff --git a/src/index.js b/src/index.js
index 707dd73..ec8ed12 100755
--- a/src/index.js
+++ b/src/index.js
@@ -147,6 +147,12 @@ module.exports = (function() {
       .sort(function(rel1, rel2){ //using order
         var index1 = order.indexOf( path.basename(rel1.attrib.Type) );
         var index2 = order.indexOf( path.basename(rel2.attrib.Type) );
+        // If the attrib.Type is not in the order list, go to the end of sort
+        // Maybe we can do it more gracefully with the boolean operator
+        if ( index1 < 0 && index2 >= 0 ) return 1; // rel1 go after rel2
+        if ( index1 >= 0 && index2 < 0 ) return -1; // rel1 go before rel2
+        if ( index1 < 0 && index2 < 0 ) return 0; // change nothing
+
         if ((index1 + index2) == 0) {
             if(rel1.attrib.Id && rel2.attrib.Id) return rel1.attrib.Id.substring(3) - rel2.attrib.Id.substring(3);
           return rel1._id - rel2._id;
diff --git a/test/crud-test.ts b/test/crud-test.ts
index 3557a62..ed4822c 100644
--- a/test/crud-test.ts
+++ b/test/crud-test.ts
@@ -1243,4 +1243,34 @@ describe("CRUD operations", function() {
             });
         });
     });
+
+    describe("Rebuild file", function() {
+        it("Rebuild archive file with custom Relationship workbook rels after delete a sheet", function (done) {
+            fs.readFile(path.join(__dirname, 'templates', 'custom-xml.xlsx'), function(err, buffer) {
+                expect(err).toBeNull();
+                // Create a template
+                var t = new XlsxTemplate(buffer);
+
+                t.deleteSheet("Sheet2");
+                var newData     = t.generate();
+                var wbrels      = etree.parse(t.archive.file("xl/_rels/workbook.xml.rels").asText()).getroot();
+                expect(wbrels.find("Relationship[@Id='rId1']").attrib.Target).toEqual("worksheets/sheet1.xml");
+                expect(wbrels.find("Relationship[@Id='rId1']").attrib.Type).toEqual("http://schemas.openxmlformats.org/officeDocument/2006/relationships/worksheet");
+                expect(wbrels.find("Relationship[@Id='rId2']").attrib.Target).toEqual("worksheets/sheet3.xml");
+                expect(wbrels.find("Relationship[@Id='rId2']").attrib.Type).toEqual("http://schemas.openxmlformats.org/officeDocument/2006/relationships/worksheet");
+                expect(wbrels.find("Relationship[@Id='rId3']").attrib.Target).toEqual("theme/theme1.xml");
+                expect(wbrels.find("Relationship[@Id='rId3']").attrib.Type).toEqual("http://schemas.openxmlformats.org/officeDocument/2006/relationships/theme");
+                expect(wbrels.find("Relationship[@Id='rId4']").attrib.Target).toEqual("styles.xml");
+                expect(wbrels.find("Relationship[@Id='rId4']").attrib.Type).toEqual("http://schemas.openxmlformats.org/officeDocument/2006/relationships/styles");
+                expect(wbrels.find("Relationship[@Id='rId5']").attrib.Target).toEqual("sharedStrings.xml");
+                expect(wbrels.find("Relationship[@Id='rId5']").attrib.Type).toEqual("http://schemas.openxmlformats.org/officeDocument/2006/relationships/sharedStrings");
+                expect(wbrels.find("Relationship[@Id='rId6']").attrib.Target).toEqual("xmlMaps.xml");
+                expect(wbrels.find("Relationship[@Id='rId6']").attrib.Type).toEqual("http://schemas.openxmlformats.org/officeDocument/2006/relationships/xmlMaps");
+                expect(wbrels.find("Relationship[@Id='rId7']").attrib.Target).toEqual("connections.xml");
+                expect(wbrels.find("Relationship[@Id='rId7']").attrib.Type).toEqual("http://schemas.openxmlformats.org/officeDocument/2006/relationships/connections");
+                fs.writeFileSync('test/output/custom-xml.xlsx', newData, 'binary');
+                done();
+            });
+        });
+    });
 });
diff --git a/test/templates/custom-xml.xlsx b/test/templates/custom-xml.xlsx
new file mode 100644
index 0000000..66bffa1
Binary files /dev/null and b/test/templates/custom-xml.xlsx differ