2 files changed, 16 insertions, 7 deletions
diff --git a/packages/monorepo-scripts/src/publish.ts b/packages/monorepo-scripts/src/publish.ts
index cdd250ec3..5f4c67e04 100644
--- a/packages/monorepo-scripts/src/publish.ts
+++ b/packages/monorepo-scripts/src/publish.ts
@@ -213,12 +213,16 @@ async function lernaPublishAsync(packageToVersionChange: { [name: string]: strin
 }
 
 function updateVersionNumberIfNeeded(currentVersion: string, proposedNextVersion: string): string {
+    const updatedVersionIfValid = semver.inc(currentVersion, 'patch');
+    if (_.isNull(updatedVersionIfValid)) {
+        throw new Error(`Encountered invalid semver: ${currentVersion}`);
+    }
     if (proposedNextVersion === currentVersion) {
-        return utils.getNextPatchVersion(currentVersion);
+        return updatedVersionIfValid;
     }
     const sortedVersions = semverSort.desc([proposedNextVersion, currentVersion]);
     if (sortedVersions[0] !== proposedNextVersion) {
-        return utils.getNextPatchVersion(currentVersion);
+        return updatedVersionIfValid;
     }
     return proposedNextVersion;
 }
diff --git a/packages/monorepo-scripts/src/utils/utils.ts b/packages/monorepo-scripts/src/utils/utils.ts
index 16a84b869..20bc57bae 100644
--- a/packages/monorepo-scripts/src/utils/utils.ts
+++ b/packages/monorepo-scripts/src/utils/utils.ts
@@ -1,6 +1,7 @@
 import lernaGetPackages = require('lerna-get-packages');
 import * as _ from 'lodash';
 import { exec as execAsync } from 'promisify-child-process';
+import semver = require('semver');
 
 import { constants } from '../constants';
 import { GitTagsByPackageName, UpdatedPackage } from '../types';
@@ -37,15 +38,19 @@ export const utils = {
         packageName: string,
         packageLocation: string,
     ): Promise<string> {
-        let nextVersion;
+        let nextVersionIfValid;
         const changelog = changelogUtils.getChangelogOrCreateIfMissing(packageName, packageLocation);
         if (_.isEmpty(changelog)) {
-            nextVersion = this.getNextPatchVersion(currentVersion);
+            nextVersionIfValid = semver.inc(currentVersion, 'patch');
         }
         const lastEntry = changelog[0];
-        nextVersion =
-            lastEntry.version === currentVersion ? this.getNextPatchVersion(currentVersion) : lastEntry.version;
-        return nextVersion;
+        nextVersionIfValid = semver.eq(lastEntry.version, currentVersion)
+            ? semver.inc(currentVersion, 'patch')
+            : lastEntry.version;
+        if (_.isNull(nextVersionIfValid)) {
+            throw new Error(`Encountered invalid semver: ${currentVersion} associated with ${packageName}`);
+        }
+        return nextVersionIfValid;
     },
     async getRemoteGitTagsAsync(): Promise<string[]> {
         const result = await execAsync(`git ls-remote --tags`, {