diff --git a/lib/galaxy/tool_util/deps/container_resolvers/mulled.py b/lib/galaxy/tool_util/deps/container_resolvers/mulled.py
index aa3d3f112bc..b0eede03fa7 100644
--- a/lib/galaxy/tool_util/deps/container_resolvers/mulled.py
+++ b/lib/galaxy/tool_util/deps/container_resolvers/mulled.py
@@ -268,21 +268,14 @@ def targets_to_mulled_name(targets, hash_func, namespace, resolution_cache=None)
         tags = mulled_tags_for(namespace, target.package_name, resolution_cache=resolution_cache)
 
         if tags:
-            if target_version:
-                for tag in tags:
-                    if '--' in tag:
-                        version, build = split_tag(tag)
-                    else:
-                        version = tag
-                        build = None
-                    if version == target_version:
-                        name = "{}:{}".format(target.package_name, version)
-                        if build:
-                            name = "{}--{}".format(name, build)
-                        break
-            else:
-                version, build = split_tag(tags[0])
-                name = "{}:{}--{}".format(target.package_name, version, build)
+            for tag in tags:
+                if '--' in tag:
+                    version, _ = split_tag(tag)
+                else:
+                    version = tag
+                if target_version and version == target_version:
+                    name = "{}:{}".format(target.package_name, tag)
+                    break
 
     else:
         def first_tag_if_available(image_name):
diff --git a/lib/galaxy/web_stack/__init__.py b/lib/galaxy/web_stack/__init__.py
index 0d1be0ea540..211b190b121 100644
--- a/lib/galaxy/web_stack/__init__.py
+++ b/lib/galaxy/web_stack/__init__.py
@@ -530,6 +530,9 @@ class WeblessApplicationStack(ApplicationStack):
         # isolation if it doesn't, or DB_PREASSIGN if the job_config doesn't allow either.
         conf_class_name = job_config.__class__.__name__
         remove_methods = [HANDLER_ASSIGNMENT_METHODS.DB_SELF]
+        with self.app.model.session.connection():
+            # Force a connection so dialect.server_version_info is populated
+            pass
         dialect = self.app.model.session.bind.dialect
         if ((dialect.name == 'postgresql' and dialect.server_version_info >= (9, 5))
                 or (dialect.name == 'mysql' and dialect.server_version_info >= (8, 0, 1))):