diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index ba24a07e66..4ec740e2fd 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -56,7 +56,7 @@ repos:
           - tomli
 
   - repo: https://github.com/commitizen-tools/commitizen
-    rev: v4.13.8 # automatically updated by Commitizen
+    rev: v4.13.9 # automatically updated by Commitizen
     hooks:
       - id: commitizen
       - id: commitizen-branch
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7ab2bc2481..31bbd5a29f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+## v4.13.9 (2026-02-25)
+
+### Fix
+
+- avoid raising an exception when a change_type is not defined (#1879)
+
 ## v4.13.8 (2026-02-18)
 
 ### Fix
diff --git a/commitizen/__version__.py b/commitizen/__version__.py
index 061dda4064..c7a3dc0c86 100644
--- a/commitizen/__version__.py
+++ b/commitizen/__version__.py
@@ -1 +1 @@
-__version__ = "4.13.8"
+__version__ = "4.13.9"
diff --git a/commitizen/changelog.py b/commitizen/changelog.py
index 8d01bebc17..d8b8acccae 100644
--- a/commitizen/changelog.py
+++ b/commitizen/changelog.py
@@ -193,7 +193,7 @@ def process_commit_message(
     messages = [processed_msg] if isinstance(processed_msg, dict) else processed_msg
     for msg in messages:
         change_type = msg.pop("change_type", None)
-        if change_type_map:
+        if change_type_map and change_type:
             change_type = change_type_map.get(change_type, change_type)
         ref_changes[change_type].append(msg)
 
diff --git a/docs/commands/bump.md b/docs/commands/bump.md
index cbd6d5452b..51293bca4b 100644
--- a/docs/commands/bump.md
+++ b/docs/commands/bump.md
@@ -1,4 +1,4 @@
-![Bump version](../images/bump.gif)
+![Bump version](../images/cli_interactive/bump.gif)
 
 ## About
 
diff --git a/docs/images/bump.gif b/docs/images/bump.gif
deleted file mode 100644
index 0e97550ade..0000000000
Binary files a/docs/images/bump.gif and /dev/null differ
diff --git a/docs/images/bump.tape b/docs/images/bump.tape
new file mode 100644
index 0000000000..08003602e2
--- /dev/null
+++ b/docs/images/bump.tape
@@ -0,0 +1,134 @@
+Output cli_interactive/bump.gif
+
+Require cz
+
+# Use bash for cross-platform compatibility (macOS, Linux, Windows)
+Set Shell bash
+
+Set FontSize 16
+Set Width 878
+Set Height 568
+Set Padding 20
+Set TypingSpeed 50ms
+
+Set Theme {
+  "name": "Commitizen",
+  "black": "#232628",
+  "red": "#fc4384",
+  "green": "#b3e33b",
+  "yellow": "#ffa727",
+  "blue": "#75dff2",
+  "magenta": "#ae89fe",
+  "cyan": "#708387",
+  "white": "#d5d5d0",
+  "brightBlack": "#626566",
+  "brightRed": "#ff7fac",
+  "brightGreen": "#c8ed71",
+  "brightYellow": "#ebdf86",
+  "brightBlue": "#75dff2",
+  "brightMagenta": "#ae89fe",
+  "brightCyan": "#b1c6ca",
+  "brightWhite": "#f9f9f4",
+  "background": "#1e1e2e",
+  "foreground": "#afafaf",
+  "cursor": "#c7c7c7"
+}
+
+# Hide initial shell prompt
+Hide
+
+# Wait for terminal to be ready
+Sleep 1s
+
+# Set a clean, simple prompt (while hidden)
+Type "PS1='$ '"
+Enter
+Sleep 300ms
+
+# Create a clean temporary directory for recording
+Type "rm -rf /tmp/commitizen-example && mkdir -p /tmp/commitizen-example && cd /tmp/commitizen-example"
+Enter
+Sleep 500ms
+
+# Initialize git repository
+Type "git init"
+Enter
+Type "git config user.email 'you@example.com'"
+Enter
+Type "git config user.name 'Your Name'"
+Enter
+Sleep 500ms
+
+# Initialize commitizen config with version 0.0.1 and changelog enabled
+Type `cat > pyproject.toml << 'EOF'`
+Enter
+Sleep 100ms
+Type `[tool.commitizen]`
+Enter
+Sleep 100ms
+Type `version = "0.0.1"`
+Enter
+Sleep 100ms
+Type `update_changelog_on_bump = true`
+Enter
+Sleep 100ms
+Type "EOF"
+Enter
+Sleep 300ms
+
+# Create initial commit (no tag, so cz bump will ask "Is this the first tag created?")
+Type "git add pyproject.toml"
+Enter
+Sleep 300ms
+
+Type "git commit -m 'chore: initial commit'"
+Enter
+Sleep 500ms
+
+# Create a feat commit that will trigger a MINOR bump (0.0.1 -> 0.1.0)
+Type "echo 'new feature' > feature.py"
+Enter
+Sleep 300ms
+
+Type "git add feature.py"
+Enter
+Sleep 300ms
+
+Type "git commit -m 'feat: add awesome new feature'"
+Enter
+Sleep 500ms
+
+# Clear the screen to start fresh
+Type "clear"
+Enter
+Sleep 500ms
+
+# Show commands from here
+Show
+
+# Step 1: Show current version
+Type "cz version --project"
+Sleep 500ms
+Enter
+Sleep 1s
+
+# Step 2: Run cz bump (no existing tag, will prompt for first tag)
+Type "cz bump"
+Sleep 500ms
+Enter
+
+# Wait for the "Is this the first tag created?" prompt
+Sleep 2s
+
+# Answer Yes to "Is this the first tag created?" (default is Yes, just press Enter)
+Enter
+Sleep 3s
+
+# Step 3: Show new version after bump
+Type "cz version --project"
+Sleep 500ms
+Enter
+Sleep 1s
+
+# Wait for final output
+Sleep 3s
diff --git a/docs/images/cli_interactive/bump.gif b/docs/images/cli_interactive/bump.gif
new file mode 100644
index 0000000000..e452e6d8db
Binary files /dev/null and b/docs/images/cli_interactive/bump.gif differ
diff --git a/docs/images/cli_interactive/commit.gif b/docs/images/cli_interactive/commit.gif
index 12b62cd223..a03139f480 100644
Binary files a/docs/images/cli_interactive/commit.gif and b/docs/images/cli_interactive/commit.gif differ
diff --git a/docs/images/cli_interactive/init.gif b/docs/images/cli_interactive/init.gif
index 2f8a01f8b0..bc90592c07 100644
Binary files a/docs/images/cli_interactive/init.gif and b/docs/images/cli_interactive/init.gif differ
diff --git a/docs/images/commit.tape b/docs/images/commit.tape
index 42aa25a023..f05a354e7b 100644
--- a/docs/images/commit.tape
+++ b/docs/images/commit.tape
@@ -53,6 +53,10 @@ Sleep 500ms
 # Initialize git repository
 Type "git init"
 Enter
+Type "git config user.email 'you@example.com'"
+Enter
+Type "git config user.name 'Your Name'"
+Enter
 Sleep 500ms
 
 Type "git checkout -b awesome-feature"
diff --git a/pyproject.toml b/pyproject.toml
index 2670a0d857..64f7d7c914 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "commitizen"
-version = "4.13.8"
+version = "4.13.9"
 description = "Python commitizen client tool"
 authors = [{ name = "Santiago Fraire", email = "santiwilly@gmail.com" }]
 maintainers = [
diff --git a/uv.lock b/uv.lock
index 12e9c4dfb0..60869fbb11 100644
--- a/uv.lock
+++ b/uv.lock
@@ -195,7 +195,7 @@ wheels = [
 
 [[package]]
 name = "commitizen"
-version = "4.13.8"
+version = "4.13.9"
 source = { editable = "." }
 dependencies = [
     { name = "argcomplete" },