diff --git a/CHANGES.txt b/CHANGES.txt
index f51f673f6..ed587b765 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,5 +1,12 @@
 Summary of changes to citeproc-js since version 1.2 release.
 
+========================
+Changes in version 1.2.6
+========================
+
+- Avoid potential type error when strip-periods is set
+  on cs:date-part
+
 ========================
 Changes in version 1.2.5
 ========================
diff --git a/citeproc.js b/citeproc.js
index c35115438..2591522ba 100644
--- a/citeproc.js
+++ b/citeproc.js
@@ -23,7 +23,7 @@ Copyright (c) 2009-2019 Frank Bennett
     <http://www.gnu.org/licenses/> respectively.
 */
 var CSL = {
-    PROCESSOR_VERSION: "1.2.5",
+    PROCESSOR_VERSION: "1.2.6",
     LOCATOR_LABELS_REGEXP: new RegExp("^((art|ch|subch|col|fig|l|n|no|op|p|pp|para|subpara|supp|pt|r|sec|subsec|sv|sch|tit|vrs|vol)\\.)\\s+(.*)"),
     STATUTE_SUBDIV_PLAIN_REGEX: /(?:(?:^| )(?:art|bk|ch|subch|col|fig|fol|l|n|no|op|p|pp|para|subpara|supp|pt|r|sec|subsec|sv|sch|tit|vrs|vol)\. *)/,
     STATUTE_SUBDIV_PLAIN_REGEX_FRONT: /(?:^\s*[.,;]*\s*(?:art|bk|ch|subch|col|fig|fol|l|n|no|op|p|pp|para|subpara|supp|pt|r|sec|subsec|sv|sch|tit|vrs|vol)\. *)/,
@@ -7228,6 +7228,25 @@ CSL.Node["date-part"] = {
         }
         state.build.date_parts.push(this.strings.name);
         var date_variable = state.build.date_variables[0];
+        function formatAndStrip(myform, gender, val) {
+            if (!val) {
+                return val;
+            }
+            val = "" + CSL.Util.Dates[this.strings.name][myform](state, val, gender, this.default_locale);
+            if ("month" === this.strings.name) {
+                if (state.tmp.strip_periods) {
+                    val = val.replace(/\./g, "");
+                } else {
+                    for (var i = 0, ilen = this.decorations.length; i < ilen; i += 1) {
+                        if ("@strip-periods" === this.decorations[i][0] && "true" === this.decorations[i][1]) {
+                            val = val.replace(/\./g, "");
+                            break;
+                        }
+                    }
+                }
+            }
+            return val;
+        }
         func = function (state, Item) {
             if (!state.tmp.date_object) {
                 return;
@@ -7301,32 +7320,8 @@ CSL.Node["date-part"] = {
                             myform = "numeric";
                         }
                     }
-                    value = CSL.Util.Dates[this.strings.name][myform](state, value, gender, this.default_locale);
-                    if ("month" === this.strings.name) {
-                        if (state.tmp.strip_periods) {
-                            value = value.replace(/\./g, "");
-                        } else {
-                            for (var i = 0, ilen = this.decorations.length; i < ilen; i += 1) {
-                                if ("@strip-periods" === this.decorations[i][0] && "true" === this.decorations[i][1]) {
-                                    value = value.replace(/\./g, "");
-                                    break;
-                                }
-                            }
-                        }
-                    }
-                    if (value_end) {
-                        value_end = CSL.Util.Dates[this.strings.name][myform](state, value_end, gender, ("accessed" === date_variable), "_end");
-                        if (state.tmp.strip_periods) {
-                            value_end = value_end.replace(/\./g, "");
-                        } else {
-                            for (var i = 0, ilen = this.decorations.length; i < ilen; i += 1) {
-                                if ("@strip-periods" === this.decorations[i][0] && "true" === this.decorations[i][1]) {
-                                    value_end = value_end.replace(/\./g, "");
-                                    break;
-                                }
-                            }
-                        }
-                    }
+                    value = formatAndStrip.call(this, myform, gender, value);
+                    value_end = formatAndStrip.call(this, myform, gender, value_end);
                 }
                 state.output.openLevel("empty");
                 if (state.tmp.date_collapse_at.length) {
diff --git a/citeproc_commonjs.js b/citeproc_commonjs.js
index ea3a9f488..e2683d8c5 100644
--- a/citeproc_commonjs.js
+++ b/citeproc_commonjs.js
@@ -23,7 +23,7 @@ Copyright (c) 2009-2019 Frank Bennett
     <http://www.gnu.org/licenses/> respectively.
 */
 var CSL = {
-    PROCESSOR_VERSION: "1.2.5",
+    PROCESSOR_VERSION: "1.2.6",
     LOCATOR_LABELS_REGEXP: new RegExp("^((art|ch|subch|col|fig|l|n|no|op|p|pp|para|subpara|supp|pt|r|sec|subsec|sv|sch|tit|vrs|vol)\\.)\\s+(.*)"),
     STATUTE_SUBDIV_PLAIN_REGEX: /(?:(?:^| )(?:art|bk|ch|subch|col|fig|fol|l|n|no|op|p|pp|para|subpara|supp|pt|r|sec|subsec|sv|sch|tit|vrs|vol)\. *)/,
     STATUTE_SUBDIV_PLAIN_REGEX_FRONT: /(?:^\s*[.,;]*\s*(?:art|bk|ch|subch|col|fig|fol|l|n|no|op|p|pp|para|subpara|supp|pt|r|sec|subsec|sv|sch|tit|vrs|vol)\. *)/,
@@ -7228,6 +7228,25 @@ CSL.Node["date-part"] = {
         }
         state.build.date_parts.push(this.strings.name);
         var date_variable = state.build.date_variables[0];
+        function formatAndStrip(myform, gender, val) {
+            if (!val) {
+                return val;
+            }
+            val = "" + CSL.Util.Dates[this.strings.name][myform](state, val, gender, this.default_locale);
+            if ("month" === this.strings.name) {
+                if (state.tmp.strip_periods) {
+                    val = val.replace(/\./g, "");
+                } else {
+                    for (var i = 0, ilen = this.decorations.length; i < ilen; i += 1) {
+                        if ("@strip-periods" === this.decorations[i][0] && "true" === this.decorations[i][1]) {
+                            val = val.replace(/\./g, "");
+                            break;
+                        }
+                    }
+                }
+            }
+            return val;
+        }
         func = function (state, Item) {
             if (!state.tmp.date_object) {
                 return;
@@ -7301,32 +7320,8 @@ CSL.Node["date-part"] = {
                             myform = "numeric";
                         }
                     }
-                    value = CSL.Util.Dates[this.strings.name][myform](state, value, gender, this.default_locale);
-                    if ("month" === this.strings.name) {
-                        if (state.tmp.strip_periods) {
-                            value = value.replace(/\./g, "");
-                        } else {
-                            for (var i = 0, ilen = this.decorations.length; i < ilen; i += 1) {
-                                if ("@strip-periods" === this.decorations[i][0] && "true" === this.decorations[i][1]) {
-                                    value = value.replace(/\./g, "");
-                                    break;
-                                }
-                            }
-                        }
-                    }
-                    if (value_end) {
-                        value_end = CSL.Util.Dates[this.strings.name][myform](state, value_end, gender, ("accessed" === date_variable), "_end");
-                        if (state.tmp.strip_periods) {
-                            value_end = value_end.replace(/\./g, "");
-                        } else {
-                            for (var i = 0, ilen = this.decorations.length; i < ilen; i += 1) {
-                                if ("@strip-periods" === this.decorations[i][0] && "true" === this.decorations[i][1]) {
-                                    value_end = value_end.replace(/\./g, "");
-                                    break;
-                                }
-                            }
-                        }
-                    }
+                    value = formatAndStrip.call(this, myform, gender, value);
+                    value_end = formatAndStrip.call(this, myform, gender, value_end);
                 }
                 state.output.openLevel("empty");
                 if (state.tmp.date_collapse_at.length) {
diff --git a/package.json b/package.json
index 1c74c4b1e..5056d02e7 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
     "name": "citeproc",
-    "version": "2.2.5",
-    "description": "The citeproc-js citation formatting module, in CommonJS format. This version is based on citeproc-js 1.2.5",
+    "version": "2.2.6",
+    "description": "The citeproc-js citation formatting module, in CommonJS format. This version is based on citeproc-js 1.2.6",
     "main": "citeproc_commonjs.js",
     "repository": {
         "type": "git",
diff --git a/src/load.js b/src/load.js
index e4561ec22..21e8f17c2 100644
--- a/src/load.js
+++ b/src/load.js
@@ -35,7 +35,7 @@
 
 var CSL = {
 
-    PROCESSOR_VERSION: "1.2.5",
+    PROCESSOR_VERSION: "1.2.6",
 
     LOCATOR_LABELS_REGEXP: new RegExp("^((art|ch|subch|col|fig|l|n|no|op|p|pp|para|subpara|supp|pt|r|sec|subsec|sv|sch|tit|vrs|vol)\\.)\\s+(.*)"),