diff --git a/packages/zowe-explorer-api/__tests__/__unit__/profiles/ZoweExplorerZosmfApi.unit.test.ts b/packages/zowe-explorer-api/__tests__/__unit__/profiles/ZoweExplorerZosmfApi.unit.test.ts
index 6a9f113f21..4df0e17aed 100644
--- a/packages/zowe-explorer-api/__tests__/__unit__/profiles/ZoweExplorerZosmfApi.unit.test.ts
+++ b/packages/zowe-explorer-api/__tests__/__unit__/profiles/ZoweExplorerZosmfApi.unit.test.ts
@@ -90,37 +90,43 @@ async function expectApiWithSession<T>({ name, spy, args, transform }: ITestApi<
     expect(spy).toHaveBeenCalledWith(fakeSession, ...params);
 }
 
+describe("CommonApi", () => {
+    describe("getSession", () => {
+        it("returns undefined and does not throw error if the session was not created", () => {
+            const api = new ZoweExplorerZosmf.CommonApi();
+            let session: imperative.Session;
+            expect(() => (session = api.getSession())).not.toThrow();
+            expect(session).toBe(undefined);
+        });
+        it("returns a built session from _getSession and does not throw error", () => {
+            const api = new ZoweExplorerZosmf.CommonApi(loadedProfile);
+            let session: imperative.Session;
+            const _getSessionSpy = jest.spyOn(api as any, "_getSession");
+            expect(() => (session = api.getSession())).not.toThrow();
+            expect(_getSessionSpy).toHaveBeenCalledTimes(1);
+            expect(session).not.toBeUndefined();
+        });
+    });
+});
+
 describe("ZosmfUssApi", () => {
     afterEach(() => {
         jest.clearAllMocks();
     });
 
     describe("_getSession", () => {
-        const exampleProfile = {
-            message: "",
-            type: "zosmf",
-            failNotFound: false,
-            name: "test.zosmf",
-            profile: {
-                host: "localhost",
-                password: "password",
-                protocol: "http",
-                user: "aZosmfUser",
-                ...fakeProperties,
-            },
-        } as imperative.IProfileLoaded;
-        const exampleSession = imperative.Session.createFromUrl(new URL("http://localhost"));
-        exampleSession.ISession.password = exampleProfile.profile?.password;
-        exampleSession.ISession.user = exampleProfile.profile?.user;
-        jest.spyOn(ProfilesCache, "getProfileSessionWithVscProxy").mockReturnValueOnce(exampleSession as any);
+        const exampleSession = Object.assign(Object.create(Object.getPrototypeOf(fakeSession)), fakeSession);
+        exampleSession.ISession.password = loadedProfile.profile?.password;
+        exampleSession.ISession.user = loadedProfile.profile?.user;
+        jest.spyOn(ProfilesCache, "getProfileSessionWithVscProxy").mockReturnValueOnce(exampleSession);
 
         it("should include profile properties in the built session object", () => {
             const api = new ZoweExplorerZosmf.UssApi(loadedProfile);
 
-            const transformedProps: Record<string, any> = { ...exampleProfile.profile, hostname: exampleProfile.profile?.host, ...fakeProperties };
+            const transformedProps: Record<string, any> = { ...loadedProfile.profile, hostname: loadedProfile.profile?.host, ...fakeProperties };
             delete transformedProps["host"];
             delete transformedProps["responseTimeout"];
-            expect((api as any)._getSession(exampleProfile).mISession).toMatchObject(transformedProps);
+            expect((api as any)._getSession(loadedProfile).mISession).toMatchObject(transformedProps);
         });
     });
 
diff --git a/packages/zowe-explorer-api/src/profiles/ZoweExplorerZosmfApi.ts b/packages/zowe-explorer-api/src/profiles/ZoweExplorerZosmfApi.ts
index e71dbcecd4..2aa8285d74 100644
--- a/packages/zowe-explorer-api/src/profiles/ZoweExplorerZosmfApi.ts
+++ b/packages/zowe-explorer-api/src/profiles/ZoweExplorerZosmfApi.ts
@@ -29,7 +29,7 @@ export namespace ZoweExplorerZosmf {
     /**
      * An implementation of the Zowe Explorer API Common interface for zOSMF.
      */
-    class CommonApi implements MainframeInteraction.ICommon {
+    export class CommonApi implements MainframeInteraction.ICommon {
         public static getProfileTypeName(): string {
             return zosmf.ZosmfProfile.type;
         }
@@ -55,7 +55,7 @@ export namespace ZoweExplorerZosmf {
                 // todo: initialize and use logging
                 imperative.Logger.getAppLogger().error(error as string);
             }
-            return ProfilesCache.getProfileSessionWithVscProxy(this.session);
+            return this.session ? ProfilesCache.getProfileSessionWithVscProxy(this.session) : undefined;
         }
 
         private _getSession(serviceProfile: imperative.IProfileLoaded): imperative.Session {
diff --git a/packages/zowe-explorer/CHANGELOG.md b/packages/zowe-explorer/CHANGELOG.md
index cd8b280e4f..da692418ee 100644
--- a/packages/zowe-explorer/CHANGELOG.md
+++ b/packages/zowe-explorer/CHANGELOG.md
@@ -11,6 +11,7 @@ All notable changes to the "vscode-extension-for-zowe" extension will be documen
 
 ### Bug fixes
 
+- Fixed an issue where a TypeError occurred when applying VS Code proxy settings to an invalid session. [#3425](https://github.com/zowe/zowe-explorer-vscode/issues/3425)
 - Fixed issue where the 'Delete' key binding for the USS tree returns a 'contextValue' error. [#2796](https://github.com/zowe/zowe-explorer-vscode/issues/2796)
 
 ## `3.1.0`