diff --git a/core/core.js b/core/core.js
index 48919692..8b4abb78 100644
--- a/core/core.js
+++ b/core/core.js
@@ -215,7 +215,7 @@ async function getProcessBlob(blobId, key, options) {
 							if (gGlobalSettings.userPermissions[user][options.packageOwner][options.packageName][permission]) {
 								return true;
 							} else {
-								return false;
+								throw Error(`Permission denied: ${permission}.`);
 							}
 
 						} else {
@@ -227,13 +227,11 @@ async function getProcessBlob(blobId, key, options) {
 									return true;
 								} else if (value == 'deny') {
 									storePermission(user, options.packageOwner, options.packageName, permission, false);
-									return false;
+									throw Error(`Permission denied: ${permission}.`);
 								} else if (value == 'deny once') {
-									return false;
+									throw Error(`Permission denied: ${permission}.`);
 								}
-								return false;
-							}).catch(function() {
-								return false;
+								throw Error(`Permission denied: ${permission}.`);
 							});
 						}
 					},
@@ -296,10 +294,8 @@ async function getProcessBlob(blobId, key, options) {
 				if (process.credentials &&
 					process.credentials.session &&
 					process.credentials.session.name) {
-					return imports.core.permissionTest('ssb_append').then(function(value) {
-						if (value) {
-							return ssb.appendMessageWithIdentity(process.credentials.session.name, id, message);
-						}
+					return imports.core.permissionTest('ssb_append').then(function() {
+						return ssb.appendMessageWithIdentity(process.credentials.session.name, id, message);
 					});
 				}
 			};