diff --git a/src/aks-preview/HISTORY.rst b/src/aks-preview/HISTORY.rst
index 160d16426ed..e89e54ea0da 100644
--- a/src/aks-preview/HISTORY.rst
+++ b/src/aks-preview/HISTORY.rst
@@ -9,6 +9,10 @@ If there is no rush to release a new version, please just add a description of t
 
 To release a new version, please select a new version number (usually plus 1 to last patch version, X.Y.Z -> Major.Minor.Patch, more details in `\doc <https://semver.org/>`_), and then add a new section named as the new version number in this file, the content should include the new modifications and everything from the *Pending* section. Finally, update the `VERSION` variable in `setup.py` with this new version number.
 
+13.0.0b4
++++++++
+* `az aks nodepool upgrade`: Fix `--node-soak-duration` cannot be specified as 0
+
 13.0.0b3
 +++++++
 * `az aks create`: Update outbound type selection logic for automatic cluster when customer brings BYO Vnet.
diff --git a/src/aks-preview/azext_aks_preview/custom.py b/src/aks-preview/azext_aks_preview/custom.py
index 282a541a3bd..402cfeed67c 100644
--- a/src/aks-preview/azext_aks_preview/custom.py
+++ b/src/aks-preview/azext_aks_preview/custom.py
@@ -1433,7 +1433,7 @@ def aks_agentpool_upgrade(cmd,
         instance.upgrade_settings.max_surge = max_surge
     if drain_timeout:
         instance.upgrade_settings.drain_timeout_in_minutes = drain_timeout
-    if node_soak_duration:
+    if isinstance(node_soak_duration, int) and node_soak_duration >= 0:
         instance.upgrade_settings.node_soak_duration_in_minutes = node_soak_duration
     if undrainable_node_behavior:
         instance.upgrade_settings.undrainable_node_behavior = undrainable_node_behavior
diff --git a/src/aks-preview/setup.py b/src/aks-preview/setup.py
index 736c4785c8d..33da92678be 100644
--- a/src/aks-preview/setup.py
+++ b/src/aks-preview/setup.py
@@ -9,7 +9,7 @@
 
 from setuptools import setup, find_packages
 
-VERSION = "13.0.0b3"
+VERSION = "13.0.0b4"
 
 CLASSIFIERS = [
     "Development Status :: 4 - Beta",