diff --git a/pillar/__init__.py b/pillar/__init__.py
index 3506ec3e..579a495d 100644
--- a/pillar/__init__.py
+++ b/pillar/__init__.py
@@ -317,6 +317,7 @@ class PillarServer(Eve):
             (sdk_exceptions.ResourceNotFound, self.handle_sdk_resource_not_found),
             (sdk_exceptions.ResourceInvalid, self.handle_sdk_resource_invalid),
             (sdk_exceptions.MethodNotAllowed, self.handle_sdk_method_not_allowed),
+            (sdk_exceptions.PreconditionFailed, self.handle_sdk_precondition_failed),
         ]
 
         for (eclass, handler) in sdk_handlers:
@@ -341,6 +342,12 @@ class PillarServer(Eve):
         error.code = 404
         return self.pillar_error_handler(error)
 
+    def handle_sdk_precondition_failed(self, error):
+        self.log.info('Forwarding PreconditionFailed exception to client: %s', error, exc_info=True)
+
+        error.code = 412
+        return self.pillar_error_handler(error)
+
     def handle_sdk_resource_invalid(self, error):
         self.log.info('Forwarding ResourceInvalid exception to client: %s', error, exc_info=True)
 
diff --git a/src/templates/errors/412.jade b/src/templates/errors/412.jade
new file mode 100644
index 00000000..f0bd463d
--- /dev/null
+++ b/src/templates/errors/412.jade
@@ -0,0 +1,11 @@
+| {% extends "errors/layout.html" %}
+| {% block body %}
+#error_container.412.standalone
+	#error_box
+		.error-title 412. Precondition Failed.
+
+		.error-lead.
+			Someone else also edited the thing you're trying to edit.
+			Reload and try again.
+
+| {% endblock %}
diff --git a/src/templates/errors/412_embed.jade b/src/templates/errors/412_embed.jade
new file mode 100644
index 00000000..b58713f9
--- /dev/null
+++ b/src/templates/errors/412_embed.jade
@@ -0,0 +1,7 @@
+#error_container.412
+	#error_box
+		.error-title 412. Precondition Failed.
+
+		.error-lead.
+			Someone else also edited the thing you're trying to edit.
+			Reload and try again.