diff --git a/services/core/java/com/android/server/pm/PackageInstallerService.java b/services/core/java/com/android/server/pm/PackageInstallerService.java
index 840645edcb82e..8af74631fb2e5 100644
--- a/services/core/java/com/android/server/pm/PackageInstallerService.java
+++ b/services/core/java/com/android/server/pm/PackageInstallerService.java
@@ -613,6 +613,9 @@ public class PackageInstallerService extends IPackageInstaller.Stub implements
                 throw new IllegalArgumentException(
                     "APEX files can only be installed as part of a staged session.");
             }
+            if (params.isMultiPackage) {
+                throw new IllegalArgumentException("A multi-session can't be set as APEX.");
+            }
         }
 
         if (params.isStaged && !isCalledBySystemOrShell(callingUid)) {