diff --git a/chrome/content/zotero/xpcom/citeproc.js b/chrome/content/zotero/xpcom/citeproc.js
index 8ae8be93a..f368a4103 100644
--- a/chrome/content/zotero/xpcom/citeproc.js
+++ b/chrome/content/zotero/xpcom/citeproc.js
@@ -1963,7 +1963,7 @@ CSL.DateParser = function () {
 };
 CSL.Engine = function (sys, style, lang, forceLang) {
     var attrs, langspec, localexml, locale;
-    this.processor_version = "1.0.252";
+    this.processor_version = "1.0.253";
     this.csl_version = "1.0";
     this.sys = sys;
     this.sys.xml = new CSL.System.Xml.Parsing();
@@ -3586,6 +3586,7 @@ CSL.getCitationCluster = function (inputList, citationID) {
         params.have_collapsed = this.tmp.have_collapsed;
         myparams.push(params);
     }
+    this.tmp.has_purged_parallel = false;
     this.parallel.PruneOutputQueue(this);
     empties = 0;
     myblobs = this.output.queue.slice();
@@ -3642,14 +3643,18 @@ CSL.getCitationCluster = function (inputList, citationID) {
             return composite;
         }
         if ("object" === typeof composite && composite.length === 0 && !item["suppress-author"]) {
-            composite.push("[CSL STYLE ERROR: reference with no printed form.]");
+            if (this.tmp.has_purged_parallel) {
+                composite.push("");
+            } else {
+                composite.push("[CSL STYLE ERROR: reference with no printed form.]");
+            }
         }
         if (objects.length && "string" === typeof composite[0]) {
             composite.reverse();
             var tmpstr = composite.pop();
             if (tmpstr && tmpstr.slice(0, 1) === ",") {
                 objects.push(tmpstr);
-            } else {
+            } else if (tmpstr) {
                 objects.push(txt_esc(this.tmp.splice_delimiter) + tmpstr);
             }
         } else {
@@ -8828,6 +8833,7 @@ CSL.Parallel.prototype.purgeVariableBlobs = function (cite, varnames) {
                 for (ppos = llen; ppos > -1; ppos += -1) {
                     b = cite[varname].blobs[ppos];
                     b[0].blobs = b[0].blobs.slice(0, b[1]).concat(b[0].blobs.slice((b[1] + 1)));
+                    this.state.tmp.has_purged_parallel = true;
                     if (b[0] && b[0].strings && "string" == typeof b[0].strings.oops
                         && b[0].parent && b[0].parent) {
                         b[0].parent.parent.strings.delimiter = b[0].strings.oops;