diff --git a/files/es/_redirects.txt b/files/es/_redirects.txt
index 3d1771fbdb2dd5..a33be45ebd35dc 100644
--- a/files/es/_redirects.txt
+++ b/files/es/_redirects.txt
@@ -2318,12 +2318,15 @@
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 /es/docs/Web/JavaScript/Reference/Classes/Private_class_fields	/es/docs/Web/JavaScript/Reference/Classes/Private_properties
-/es/docs/Web/JavaScript/Reference/Errors/Bad_octal	/es/docs/Web/JavaScript/Reference/Errors/Deprecated_octal
-/es/docs/Web/JavaScript/Reference/Errors/Falta_puntoycoma_antes_de_declaracion	/es/docs/Web/JavaScript/Reference/Errors/Missing_semicolon_before_statement
+/es/docs/Web/JavaScript/Reference/Errors/Bad_octal	/es/docs/Web/JavaScript/Reference/Errors/Deprecated_octal_literal
+/es/docs/Web/JavaScript/Reference/Errors/Deprecated_octal	/es/docs/Web/JavaScript/Reference/Errors/Deprecated_octal_literal
+/es/docs/Web/JavaScript/Reference/Errors/Falta_puntoycoma_antes_de_declaracion	/es/docs/conflicting/Web/JavaScript/Reference/Errors/Unexpected_token
 /es/docs/Web/JavaScript/Reference/Errors/Indicador_regexp_no-val	/es/docs/Web/JavaScript/Reference/Errors/Bad_regexp_flag
 /es/docs/Web/JavaScript/Reference/Errors/Malformed_formal_parameter	/es/docs/conflicting/Web/JavaScript/Reference/Errors/Missing_formal_parameter
+/es/docs/Web/JavaScript/Reference/Errors/Missing_semicolon_before_statement	/es/docs/conflicting/Web/JavaScript/Reference/Errors/Unexpected_token
 /es/docs/Web/JavaScript/Reference/Errors/Not_a_codepoint	/es/docs/Web/JavaScript/Reference/Errors/Not_a_valid_code_point
 /es/docs/Web/JavaScript/Reference/Errors/Strict_y_parámetros_complejos	/es/docs/Web/JavaScript/Reference/Errors/Strict_non_simple_params
+/es/docs/Web/JavaScript/Reference/Errors/Undefined_prop	/es/docs/orphaned/Web/JavaScript/Reference/Errors/Undefined_prop
 /es/docs/Web/JavaScript/Reference/Errors/caracter_ilegal	/es/docs/Web/JavaScript/Reference/Errors/Illegal_character
 /es/docs/Web/JavaScript/Reference/Global_Objects/Array/toSource	/es/docs/conflicting/Web/JavaScript/Reference/Global_Objects/Array/toString
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diff --git a/files/es/_wikihistory.json b/files/es/_wikihistory.json
index 42b3a9faf91bd3..d0500f15b67518 100644
--- a/files/es/_wikihistory.json
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@@ -10532,7 +10532,7 @@
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+  "Web/JavaScript/Reference/Errors/Deprecated_octal_literal": {
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@@ -10569,10 +10569,6 @@
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     "contributors": ["hiuxmaycry", "ivandevp"]
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-    "modified": "2020-03-12T19:46:13.102Z",
-    "contributors": ["jonatanroot", "Lunacye"]
-  },
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@@ -10617,10 +10613,6 @@
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-    "modified": "2020-03-12T19:47:46.684Z",
-    "contributors": ["antixsuperstar"]
-  },
   "Web/JavaScript/Reference/Errors/Unexpected_token": {
     "modified": "2020-03-12T19:46:40.968Z",
     "contributors": ["dariomaim"]
@@ -14378,6 +14370,10 @@
     "modified": "2019-10-12T12:26:22.919Z",
     "contributors": ["JGmr5"]
   },
+  "conflicting/Web/JavaScript/Reference/Errors/Unexpected_token": {
+    "modified": "2020-03-12T19:46:13.102Z",
+    "contributors": ["jonatanroot", "Lunacye"]
+  },
   "conflicting/Web/JavaScript/Reference/Global_Objects/Array/toString": {
     "modified": "2019-03-23T22:08:25.338Z",
     "contributors": ["teoli", "pedro-otero"]
@@ -15334,6 +15330,10 @@
     "modified": "2019-03-23T22:46:15.359Z",
     "contributors": ["juanbrujo", "raecillacastellana", "vltamara"]
   },
+  "orphaned/Web/JavaScript/Reference/Errors/Undefined_prop": {
+    "modified": "2020-03-12T19:47:46.684Z",
+    "contributors": ["antixsuperstar"]
+  },
   "orphaned/Web/JavaScript/Reference/Global_Objects/Array/prototype": {
     "modified": "2020-10-15T21:35:31.913Z",
     "contributors": ["lajaso", "humbertaco"]
diff --git a/files/es/web/javascript/reference/errors/missing_semicolon_before_statement/index.md b/files/es/conflicting/web/javascript/reference/errors/unexpected_token/index.md
similarity index 93%
rename from files/es/web/javascript/reference/errors/missing_semicolon_before_statement/index.md
rename to files/es/conflicting/web/javascript/reference/errors/unexpected_token/index.md
index 967151d0c9ff97..74e78030a53090 100644
--- a/files/es/web/javascript/reference/errors/missing_semicolon_before_statement/index.md
+++ b/files/es/conflicting/web/javascript/reference/errors/unexpected_token/index.md
@@ -1,6 +1,7 @@
 ---
 title: "SyntaxError: missing ; before statement"
-slug: Web/JavaScript/Reference/Errors/Missing_semicolon_before_statement
+slug: conflicting/Web/JavaScript/Reference/Errors/Unexpected_token
+original_slug: Web/JavaScript/Reference/Errors/Missing_semicolon_before_statement
 ---
 
 {{jsSidebar("Errores")}}
diff --git a/files/es/web/javascript/reference/errors/undefined_prop/index.md b/files/es/orphaned/web/javascript/reference/errors/undefined_prop/index.md
similarity index 93%
rename from files/es/web/javascript/reference/errors/undefined_prop/index.md
rename to files/es/orphaned/web/javascript/reference/errors/undefined_prop/index.md
index edea22c6c2d42d..a9c1177d902878 100644
--- a/files/es/web/javascript/reference/errors/undefined_prop/index.md
+++ b/files/es/orphaned/web/javascript/reference/errors/undefined_prop/index.md
@@ -1,6 +1,7 @@
 ---
 title: 'ReferenceError: reference to undefined property "x"'
-slug: Web/JavaScript/Reference/Errors/Undefined_prop
+slug: orphaned/Web/JavaScript/Reference/Errors/Undefined_prop
+original_slug: Web/JavaScript/Reference/Errors/Undefined_prop
 ---
 
 {{jsSidebar("Errors")}}
diff --git a/files/es/web/javascript/reference/errors/deprecated_octal/index.md b/files/es/web/javascript/reference/errors/deprecated_octal_literal/index.md
similarity index 92%
rename from files/es/web/javascript/reference/errors/deprecated_octal/index.md
rename to files/es/web/javascript/reference/errors/deprecated_octal_literal/index.md
index 53528701fbde0a..073e13d99b9595 100644
--- a/files/es/web/javascript/reference/errors/deprecated_octal/index.md
+++ b/files/es/web/javascript/reference/errors/deprecated_octal_literal/index.md
@@ -1,6 +1,7 @@
 ---
 title: 'SyntaxError: "x" is not a legal ECMA-262 octal constant'
-slug: Web/JavaScript/Reference/Errors/Deprecated_octal
+slug: Web/JavaScript/Reference/Errors/Deprecated_octal_literal
+original_slug: Web/JavaScript/Reference/Errors/Deprecated_octal
 ---
 
 {{jsSidebar("Errors")}}