diff --git a/src/components/canvas/players/audio-player.ts b/src/components/canvas/players/audio-player.ts
index 1ff7672..81b40dd 100644
--- a/src/components/canvas/players/audio-player.ts
+++ b/src/components/canvas/players/audio-player.ts
@@ -30,6 +30,9 @@ export class AudioPlayer extends Player {
 		const audioClipConfiguration = this.clipConfiguration.asset as AudioAsset;
 
 		const identifier = audioClipConfiguration.src;
+		if (!identifier) {
+			throw new Error("Audio asset is missing a 'src'.");
+		}
 		const loadOptions: pixi.UnresolvedAsset = { src: identifier, parser: AudioLoadParser.Name };
 		const audioResource = await this.edit.assetLoader.load<howler.Howl>(identifier, loadOptions);
 
@@ -123,6 +126,9 @@ export class AudioPlayer extends Player {
 		this.syncTimer = 0;
 
 		const audioAsset = this.clipConfiguration.asset as AudioAsset;
+		if (!audioAsset.src) {
+			throw new Error("Audio asset is missing a 'src'.");
+		}
 		const loadOptions: pixi.UnresolvedAsset = { src: audioAsset.src, parser: AudioLoadParser.Name };
 		const audioResource = await this.edit.assetLoader.load<howler.Howl>(audioAsset.src, loadOptions);
 
diff --git a/src/components/canvas/players/image-player.ts b/src/components/canvas/players/image-player.ts
index c937ee5..600d569 100644
--- a/src/components/canvas/players/image-player.ts
+++ b/src/components/canvas/players/image-player.ts
@@ -86,6 +86,9 @@ export class ImagePlayer extends Player {
 	private async loadTexture(): Promise<void> {
 		const imageAsset = this.clipConfiguration.asset as ImageAsset;
 		const { src } = imageAsset;
+		if (!src) {
+			throw new Error("Image asset is missing a 'src'.");
+		}
 
 		const corsUrl = `${src}${src.includes("?") ? "&" : "?"}x-cors=1`;
 		const loadOptions: pixi.UnresolvedAsset = { src: corsUrl, crossorigin: "anonymous", data: {} };
diff --git a/src/components/canvas/players/video-player.ts b/src/components/canvas/players/video-player.ts
index 6c64f8a..9d92a90 100644
--- a/src/components/canvas/players/video-player.ts
+++ b/src/components/canvas/players/video-player.ts
@@ -168,6 +168,9 @@ export class VideoPlayer extends Player {
 	private async loadVideo(): Promise<void> {
 		const videoAsset = this.clipConfiguration.asset as VideoAsset;
 		const { src } = videoAsset;
+		if (!src) {
+			throw new Error("Video asset is missing a 'src'.");
+		}
 
 		if (src.endsWith(".mov")) {
 			throw new Error(`Video source '${src}' is not supported. .mov files cannot be played in the browser. Please convert to .webm or .mp4 first.`);
diff --git a/src/components/timeline/media-thumbnail-renderer.ts b/src/components/timeline/media-thumbnail-renderer.ts
index 3a8487d..c9ad548 100644
--- a/src/components/timeline/media-thumbnail-renderer.ts
+++ b/src/components/timeline/media-thumbnail-renderer.ts
@@ -127,7 +127,11 @@ export class MediaThumbnailRenderer implements ClipRenderer {
 		this.clipStates.set(clipKey, state);
 
 		try {
-			const result = await this.generator.generateThumbnail(asset.src, asset.trim ?? 0);
+			const { src } = asset;
+			if (!src) {
+				throw new Error("Video asset is missing a 'src'.");
+			}
+			const result = await this.generator.generateThumbnail(src, asset.trim ?? 0);
 
 			// Check if element is still in DOM (might have been disposed)
 			if (!element.isConnected) return;
@@ -156,7 +160,11 @@ export class MediaThumbnailRenderer implements ClipRenderer {
 		this.clipStates.set(clipKey, state);
 
 		try {
-			const result = await this.loadImageThumbnail(asset.src);
+			const { src } = asset;
+			if (!src) {
+				throw new Error("Image asset is missing a 'src'.");
+			}
+			const result = await this.loadImageThumbnail(src);
 
 			// Check if element is still in DOM (might have been disposed)
 			if (!element.isConnected) return;