diff --git a/convention-plugin/src/main/kotlin/org/metaborg/convention/BuildInfo.kt b/convention-plugin/src/main/kotlin/org/metaborg/convention/BuildInfo.kt
index 2b1b537..7bf09d6 100644
--- a/convention-plugin/src/main/kotlin/org/metaborg/convention/BuildInfo.kt
+++ b/convention-plugin/src/main/kotlin/org/metaborg/convention/BuildInfo.kt
@@ -18,16 +18,16 @@ object BuildInfo {
     }
 
     /** The current version. */
-    val version: String get() = checkNotNull(properties.getProperty("version"))
+    val version: String? get() = properties.getProperty("version")
     /** The most recent release version. */
-    val releaseVersion: String get() = checkNotNull(properties.getProperty("release-version"))
+    val releaseVersion: String? get() = properties.getProperty("release-version")
     /** The commit ID. */
-    val commit: String get() = checkNotNull(properties.getProperty("short-revision"))
+    val commit: String? get() = properties.getProperty("short-revision")
 
     /** The application build time, as an [Instant]; or `null` when it could not be parsed. */
-    val buildTime: Instant? get() = tryParseOffsetDateTime(buildTimeString)
+    val buildTime: Instant? get() = buildTimeString?.let { tryParseOffsetDateTime(it) }
     /** The application build time, as a string. */
-    val buildTimeString: String get() = checkNotNull(properties.getProperty("build-time"))
+    val buildTimeString: String? get() = properties.getProperty("build-time")
 
 
     /**
diff --git a/convention-plugin/src/main/kotlin/org/metaborg/convention/SettingsConventionPlugin.kt b/convention-plugin/src/main/kotlin/org/metaborg/convention/SettingsConventionPlugin.kt
index 97a7fda..b66d50a 100644
--- a/convention-plugin/src/main/kotlin/org/metaborg/convention/SettingsConventionPlugin.kt
+++ b/convention-plugin/src/main/kotlin/org/metaborg/convention/SettingsConventionPlugin.kt
@@ -17,7 +17,7 @@ import org.gradle.kotlin.dsl.maven
 class SettingsConventionPlugin: Plugin<Settings> {
 
     // Version of org.metaborg.spoofax3:catalog to be used for Metaborg projects
-    private val catalogVersion = BuildInfo.releaseVersion
+    private val catalogVersion: String? = BuildInfo.releaseVersion
 
     @Suppress("UnstableApiUsage")
     override fun apply(settings: Settings): Unit = with(settings) {
@@ -39,7 +39,7 @@ class SettingsConventionPlugin: Plugin<Settings> {
             }
             versionCatalogs {
                 create("libs") {
-                    from("org.metaborg:catalog:$catalogVersion")
+                    from("org.metaborg:catalog" + (catalogVersion?.let { ":$it" } ?: ""))
                 }
             }
         }