do not suppress first loadedScripts event; fixes #59281

src/vs/workbench/parts/debug/browser/loadedScriptsView.ts

@@ -181,7 +181,7 @@ class BaseTreeItem {
 	}
 
 	private oneChild(): BaseTreeItem {
-		if (SMART && !this._source && !this._showedMoreThanOne && !(this instanceof RootFolderTreeItem)) {
+		if (SMART && !this._source && !this._showedMoreThanOne && !(this instanceof RootFolderTreeItem) && !(this instanceof SessionTreeItem)) {
 			const keys = Object.keys(this._children);
 			if (keys.length === 1) {
 				return this._children[keys[0]];

src/vs/workbench/parts/debug/electron-browser/debugSession.ts

@@ -454,7 +454,11 @@ export class DebugSession implements IDebugSession {
 	getLoadedSources(): TPromise<Source[]> {
 		if (this.raw) {
 			return this.raw.loadedSources({}).then(response => {
-				return response.body.sources.map(src => this.getSource(src));
+				if (response.body && response.body.sources) {
+					return response.body.sources.map(src => this.getSource(src));
+				} else {
+					return [];
+				}
 			}, () => {
 				return [];
 			});