diff --git a/source/dub/internal/vibecompat/inet/path.d b/source/dub/internal/vibecompat/inet/path.d
index 5d94dea..5e97e1b 100644
--- a/source/dub/internal/vibecompat/inet/path.d
+++ b/source/dub/internal/vibecompat/inet/path.d
@@ -203,10 +203,10 @@
 		return ret;
 	}
 	
-	Path opBinary(string OP)(string rhs) const if( OP == "~" ) { assert(rhs.length > 0); return opBinary!"~"(Path(rhs)); }
-	Path opBinary(string OP)(PathEntry rhs) const if( OP == "~" ) { assert(rhs.toString().length > 0); return opBinary!"~"(Path(rhs)); }
-	void opOpAssign(string OP)(string rhs) if( OP == "~" ) { assert(rhs.length > 0); opOpAssign!"~"(Path(rhs)); }
-	void opOpAssign(string OP)(PathEntry rhs) if( OP == "~" ) { assert(rhs.toString().length > 0); opOpAssign!"~"(Path(rhs)); }
+	Path opBinary(string OP)(string rhs) const if( OP == "~" ) { assert(rhs.length > 0, "Cannot append empty path string."); return opBinary!"~"(Path(rhs)); }
+	Path opBinary(string OP)(PathEntry rhs) const if( OP == "~" ) { assert(rhs.toString().length > 0, "Cannot append empty path string."); return opBinary!"~"(Path(rhs)); }
+	void opOpAssign(string OP)(string rhs) if( OP == "~" ) { assert(rhs.length > 0, "Cannot append empty path string."); opOpAssign!"~"(Path(rhs)); }
+	void opOpAssign(string OP)(PathEntry rhs) if( OP == "~" ) { assert(rhs.toString().length > 0, "Cannot append empty path string."); opOpAssign!"~"(Path(rhs)); }
 	void opOpAssign(string OP)(Path rhs) if( OP == "~" ) { auto p = this ~ rhs; m_nodes = p.m_nodes; m_endsWithSlash = rhs.m_endsWithSlash; }
 	
 	/// Tests two paths for equality using '=='.
diff --git a/source/dub/package_.d b/source/dub/package_.d
index ba018f2..8c3b612 100644
--- a/source/dub/package_.d
+++ b/source/dub/package_.d
@@ -659,9 +659,10 @@
 			if( !platform.matchesSpecification(suffix) )
 				continue;
 
-			foreach(spath; paths){
+			foreach (spath; paths) {
+				enforce(!spath.empty, "Source paths must not be empty strings.");
 				auto path = base_path ~ spath;
-				if( !existsFile(path) || !isDir(path.toNativeString()) ){
+				if (!existsFile(path) || !isDir(path.toNativeString())) {
 					logWarn("Invalid source path: %s", path.toNativeString());
 					continue;
 				}