diff --git a/unpacked/MathJax.js b/unpacked/MathJax.js
index 117752453..2b4c1dc11 100644
--- a/unpacked/MathJax.js
+++ b/unpacked/MathJax.js
@@ -2182,7 +2182,7 @@ MathJax.Hub = {
         //
         //  Check if already processed or needs processing
         //
-        if (!script.MathJax || script.MathJax.state === STATE.PROCESSED) {state.i++; continue};
+        if (!script.parentNode || !script.MathJax || script.MathJax.state === STATE.PROCESSED) {state.i++; continue};
         if (!script.MathJax.elementJax || script.MathJax.state === STATE.UPDATE) {
           this.checkScriptSiblings(script);                 // remove preJax/postJax etc.
           var type = script.type.replace(/ *;(.|\s)*/,"");  // the input jax type
@@ -2286,7 +2286,7 @@ MathJax.Hub = {
         //  Check that there is an element jax
         //
         script = state.scripts[state.i];
-        if (!script || !script.MathJax || script.MathJax.error) {state.i++; continue}
+        if (!script || !script.parentNode || !script.MathJax || script.MathJax.error) {state.i++; continue}
         var jax = script.MathJax.elementJax; if (!jax) {state.i++; continue}
         //
         //  Call the output Jax's Process method (which will be its Translate()
diff --git a/unpacked/extensions/fast-preview.js b/unpacked/extensions/fast-preview.js
index 73f3ee43f..bc55d2a4b 100644
--- a/unpacked/extensions/fast-preview.js
+++ b/unpacked/extensions/fast-preview.js
@@ -100,7 +100,7 @@
     //  and call the PreviewHTML output jax to create the preview
     //
     Preview: function (data) {
-      if (!this.Active()) return;
+      if (!this.Active() || !data.script.parentNode) return;
       var preview = data.script.MathJax.preview || data.script.previousSibling;
       if (!preview || preview.className !== MathJax.Hub.config.preRemoveClass) {
         preview = HTML.Element("span",{className:MathJax.Hub.config.preRemoveClass});
diff --git a/unpacked/jax/output/HTML-CSS/jax.js b/unpacked/jax/output/HTML-CSS/jax.js
index eeb1db78c..6d1c72e34 100644
--- a/unpacked/jax/output/HTML-CSS/jax.js
+++ b/unpacked/jax/output/HTML-CSS/jax.js
@@ -745,9 +745,9 @@
       //
       for (i = state.HTMLCSSlast, m = state.HTMLCSSeqn; i < m; i++) {
         script = scripts[i];
-        if (script && script.MathJax.elementJax) {
-          var div = script.MathJax.elementJax.HTMLCSS.div;
-          div.className = div.className.split(/ /)[0];
+        if (script && script.parentNode && script.MathJax.elementJax) {
+          var div = (script.MathJax.elementJax.HTMLCSS||{}).div;
+          if (div) {div.className = div.className.split(/ /)[0]}
           if (script.MathJax.preview) {script.MathJax.preview.innerHTML = ""}
         }
       }
@@ -756,7 +756,7 @@
       //
       for (i = state.HTMLCSSlast, m = state.HTMLCSSeqn; i < m; i++) {
         script = scripts[i];
-        if (script && script.MathJax.elementJax) {
+        if (script && script.parentNode && script.MathJax.elementJax) {
           jax = script.MathJax.elementJax; this.getMetrics(jax);
           jax.root.toHTML(jax.HTMLCSS.span,jax.HTMLCSS.div,this.PHASE.II);
         }
@@ -766,7 +766,7 @@
       //
       for (i = state.HTMLCSSlast, m = state.HTMLCSSeqn; i < m; i++) {
         script = scripts[i];
-        if (script && script.MathJax.elementJax) {
+        if (script && script.parentNode && script.MathJax.elementJax) {
           //
           //  Finish the math with its measured size (toHTML phase III)
           //
diff --git a/unpacked/jax/output/PlainSource/jax.js b/unpacked/jax/output/PlainSource/jax.js
index a34ca39d4..aa6211564 100644
--- a/unpacked/jax/output/PlainSource/jax.js
+++ b/unpacked/jax/output/PlainSource/jax.js
@@ -65,7 +65,7 @@
         //  Remove any existing output
         //
         prev = script.previousSibling;
-        if (prev && String(prev.className).match(/^MathJax_PlainSource(_Display)?( MathJax_Processing)?$/)) {
+        if (prev && String(prev.className).match(/^MathJax(_PlainSource)?(_Display)?( MathJax_Process(ing|ed))?$/)) {
           prev.parentNode.removeChild(prev);
         }
         //
diff --git a/unpacked/jax/output/PreviewHTML/jax.js b/unpacked/jax/output/PreviewHTML/jax.js
index 1ff2c6c2e..1b17be10c 100644
--- a/unpacked/jax/output/PreviewHTML/jax.js
+++ b/unpacked/jax/output/PreviewHTML/jax.js
@@ -185,7 +185,7 @@
         //  Remove any existing output
         //
         prev = script.previousSibling;
-        if (prev && String(prev.className).match(/^MathJax_PHTML(_Display)?( MathJax_Processing)?$/))
+        if (prev && String(prev.className).match(/^MathJax(_PHTML)?(_Display)?( MathJax_Process(ing|ed))?$/))
           {prev.parentNode.removeChild(prev)}
         //
         //  Add the span, and a div if in display mode,
diff --git a/unpacked/jax/output/SVG/jax.js b/unpacked/jax/output/SVG/jax.js
index ea221f1d7..df991c6dc 100644
--- a/unpacked/jax/output/SVG/jax.js
+++ b/unpacked/jax/output/SVG/jax.js
@@ -207,7 +207,7 @@
         //  Remove any existing output
         //
         prev = script.previousSibling;
-        if (prev && String(prev.className).match(/^MathJax(_SVG)?(_Display)?( MathJax(_SVG)?_Processing)?$/))
+        if (prev && String(prev.className).match(/^MathJax(_SVG)?(_Display)?( MathJax(_SVG)?_Process(ing|ed))?$/))
           {prev.parentNode.removeChild(prev)}
         //
         //  Add the span, and a div if in display mode,