diff --git a/CHANGELOG.md b/CHANGELOG.md
index 675ffe62ba..cb68046abb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,13 +2,17 @@ ChangeLog (Release Notes)
 =========================
 主に notable な changes を書いていきます
 
+unreleased
+----------
+* Fix: 非ログイン状態ですべてのページが致命的な問題を発生させる (#89)
+
 2742 (2017/10/25)
 -----------------
-* トラブルシューティングを実装するなど
+* New: トラブルシューティングを実装するなど
 
 2735 (2017/10/22)
 -----------------
-* モバイル版からでもクライアントバージョンを確認できるように
+* New: モバイル版からでもクライアントバージョンを確認できるように
 
 2732 (2017/10/22)
 -----------------
diff --git a/src/web/app/desktop/tags/timeline.tag b/src/web/app/desktop/tags/timeline.tag
index cd7ac7d207..2d6b439e38 100644
--- a/src/web/app/desktop/tags/timeline.tag
+++ b/src/web/app/desktop/tags/timeline.tag
@@ -424,6 +424,7 @@
 		import compile from '../../common/scripts/text-compiler';
 		import dateStringify from '../../common/scripts/date-stringify';
 
+		this.mixin('i');
 		this.mixin('api');
 		this.mixin('stream');
 		this.mixin('user-preview');
@@ -462,24 +463,31 @@
 		};
 
 		this.capture = withHandler => {
-			this.stream.send({
-				type: 'capture',
-				id: this.post.id
-			});
-			if (withHandler) this.stream.on('post-updated', this.onStreamPostUpdated);
+			if (this.SIGNIN) {
+				this.stream.send({
+					type: 'capture',
+					id: this.post.id
+				});
+				if (withHandler) this.stream.on('post-updated', this.onStreamPostUpdated);
+			}
 		};
 
 		this.decapture = withHandler => {
-			this.stream.send({
-				type: 'decapture',
-				id: this.post.id
-			});
-			if (withHandler) this.stream.off('post-updated', this.onStreamPostUpdated);
+			if (this.SIGNIN) {
+				this.stream.send({
+					type: 'decapture',
+					id: this.post.id
+				});
+				if (withHandler) this.stream.off('post-updated', this.onStreamPostUpdated);
+			}
 		};
 
 		this.on('mount', () => {
 			this.capture(true);
-			this.stream.on('_connected_', this.onStreamConnected);
+
+			if (this.SIGNIN) {
+				this.stream.on('_connected_', this.onStreamConnected);
+			}
 
 			if (this.p.text) {
 				const tokens = this.p.ast;
diff --git a/src/web/app/desktop/tags/ui.tag b/src/web/app/desktop/tags/ui.tag
index fce0743ff7..e0d7393b08 100644
--- a/src/web/app/desktop/tags/ui.tag
+++ b/src/web/app/desktop/tags/ui.tag
@@ -5,7 +5,7 @@
 	<div class="content">
 		<yield />
 	</div>
-	<mk-stream-indicator/>
+	<mk-stream-indicator if={ SIGNIN }/>
 	<style>
 		:scope
 			display block
@@ -416,22 +416,26 @@
 		this.page = this.opts.page;
 
 		this.on('mount', () => {
-			this.stream.on('read_all_messaging_messages', this.onReadAllMessagingMessages);
-			this.stream.on('unread_messaging_message', this.onUnreadMessagingMessage);
+			if (this.SIGNIN) {
+				this.stream.on('read_all_messaging_messages', this.onReadAllMessagingMessages);
+				this.stream.on('unread_messaging_message', this.onUnreadMessagingMessage);
 
-			// Fetch count of unread messaging messages
-			this.api('messaging/unread').then(res => {
-				if (res.count > 0) {
-					this.update({
-						hasUnreadMessagingMessages: true
-					});
-				}
-			});
+				// Fetch count of unread messaging messages
+				this.api('messaging/unread').then(res => {
+					if (res.count > 0) {
+						this.update({
+							hasUnreadMessagingMessages: true
+						});
+					}
+				});
+			}
 		});
 
 		this.on('unmount', () => {
-			this.stream.off('read_all_messaging_messages', this.onReadAllMessagingMessages);
-			this.stream.off('unread_messaging_message', this.onUnreadMessagingMessage);
+			if (this.SIGNIN) {
+				this.stream.off('read_all_messaging_messages', this.onReadAllMessagingMessages);
+				this.stream.off('unread_messaging_message', this.onUnreadMessagingMessage);
+			}
 		});
 
 		this.onReadAllMessagingMessages = () => {
diff --git a/src/web/app/mobile/tags/timeline.tag b/src/web/app/mobile/tags/timeline.tag
index 5ecc2df9d1..c7f5bfd681 100644
--- a/src/web/app/mobile/tags/timeline.tag
+++ b/src/web/app/mobile/tags/timeline.tag
@@ -467,6 +467,7 @@
 		import getPostSummary from '../../../../common/get-post-summary.ts';
 		import openPostForm from '../scripts/open-post-form';
 
+		this.mixin('i');
 		this.mixin('api');
 		this.mixin('stream');
 
@@ -502,24 +503,31 @@
 		};
 
 		this.capture = withHandler => {
-			this.stream.send({
-				type: 'capture',
-				id: this.post.id
-			});
-			if (withHandler) this.stream.on('post-updated', this.onStreamPostUpdated);
+			if (this.SIGNIN) {
+				this.stream.send({
+					type: 'capture',
+					id: this.post.id
+				});
+				if (withHandler) this.stream.on('post-updated', this.onStreamPostUpdated);
+			}
 		};
 
 		this.decapture = withHandler => {
-			this.stream.send({
-				type: 'decapture',
-				id: this.post.id
-			});
-			if (withHandler) this.stream.off('post-updated', this.onStreamPostUpdated);
+			if (this.SIGNIN) {
+				this.stream.send({
+					type: 'decapture',
+					id: this.post.id
+				});
+				if (withHandler) this.stream.off('post-updated', this.onStreamPostUpdated);
+			}
 		};
 
 		this.on('mount', () => {
 			this.capture(true);
-			this.stream.on('_connected_', this.onStreamConnected);
+
+			if (this.SIGNIN) {
+				this.stream.on('_connected_', this.onStreamConnected);
+			}
 
 			if (this.p.text) {
 				const tokens = this.p.ast;
diff --git a/src/web/app/mobile/tags/ui.tag b/src/web/app/mobile/tags/ui.tag
index b2f738dc2e..9d9cd4d74a 100644
--- a/src/web/app/mobile/tags/ui.tag
+++ b/src/web/app/mobile/tags/ui.tag
@@ -4,7 +4,7 @@
 	<div class="content">
 		<yield />
 	</div>
-	<mk-stream-indicator/>
+	<mk-stream-indicator if={ SIGNIN }/>
 	<style>
 		:scope
 			display block